Malicious PDF — malware analysis report

Static analysis result for SHA-256 506f00b84ca60ee3…

MALICIOUS

PDF

90.8 KB Created: 2021-07-05 02:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1aa732632bc7064a6e9f90c94fa73fb7 SHA-1: 9b40ba1238301935aa085d5f00de70107dfe8a14 SHA-256: 506f00b84ca60ee3a1fe4cd0132b8670667003f24bbb0900e8d0f53ddf8323a8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains multiple links to external sites, many of which are hosted on compromised WordPress installations, suggesting a link farm used for distributing malware. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. The embedded URL 'https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=activate+office+365+kms' is presented as a lure for the user to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/acb130239ebd6f72f21669775747b130/14110872207.pdf In PDF document text
    • https://murderescape.com/wp-content/plugins/super-forms/uploads/php/files/63b784cdf9505d08ab86ddb824aaf05a/widipopusofov.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/86a46a849fb8159d853be0cc129867d8/betesetiniwagoj.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d305203fe89---zoxosebuza.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d49fb9826---vebuvosogupux.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160770c3cf08e8---86439671575.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/94298572220.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab12b964001---sipunuwe.pdfIn PDF document text
    • https://brmc.jp/user_data/userfiles/files/73102052497.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160acf1f10bccd---53007522533.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/623892e2f41591fa0535b3c9ad970ba2/xorasepepogo.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/tc85roeeq0vu505q73cls3spks/luganeradopowelugopidabi.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/31177401696.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/j288r2dh3ug9qe2ft3o6u3d3f2/92902456761.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210515/file/16210472006000.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/garoso.pdfIn PDF document text
    • https://coil.hk/upload/files/jejepevetawujuzetimi.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/1cfcc70253e8ce756948907141f069c5/48225839600.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/joriruletoz.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/b41b7d1bd1e96ddd3b010d0218e7fc07/pudazo.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a99ab8d1bde---dufonomisa.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d70d9abc660---31139378303.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d3c47e6f881fc7f981e211c9e5ac63da/nepal.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075842b76de2---lijorexezip.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/sifavoriduri.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1623009189.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/fibuwazisatopizadave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=activate+office+365+kmsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001161d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161D 17700 bytes
SHA-256: 22014f8387e335e7751fab95b246dde98af02fbbd01d68a49b882a8a3eea7a15
font_02_sfnt_off00014476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14476 10860 bytes
SHA-256: 365b9134b869c21dd6ac21e7d06233b5f50d4a3d273aa78e21f9eaddb4633333

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