Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54d793ccc6d597d…

MALICIOUS

PDF

86.2 KB Created: 2021-09-07 22:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: b0d5c969b1241e2bd97be3536ebb4908 SHA-1: 2305afdbd6c39534a0315e2bcd95dd4615055394 SHA-256: a54d793ccc6d597da883336ceb48888e91894f242286b1e5e38db6042fdf4000
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7071c686de960ff900712f966f042681/bixukejuke.pdf In PDF document text
    • https://hyundainhapkhau.vn/upload/files/dojadutujilap.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/fewiko.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/89126095696.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/9aa2b22ad5151d055ccde94e92bf308a/zidozorojetisig.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/nalosorazoterog.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc106aef70---35183838140.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/ketinorazu.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/jifutatuke.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/xujupubotixidozuki.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/kilimozate.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/boduwapulipomijifiwex.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/nifaz.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d500795eb7d---genivisajokawidemogijoko.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/s4a3pr936u9undffot1c034211/95364114360.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/gisageniv.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/83085455799.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/21848540704.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/tudevo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7b149b413---8647559053.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/jotodonosatafi.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/xujoxagexokixeze.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/21871370686.pdfIn PDF document text
    • https://ms01bet.net/contents//files/41295473596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=solutions+to+human+trafficking+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC2 11204 bytes
SHA-256: 969cc8ffc85e4262025af4a40d85f1fb253dcb650440c3a185020029bdfbce7c
font_01_sfnt_off0001058d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058D 17536 bytes
SHA-256: 88f55fbfac3b5cd0225ada38b96b78d3867035a9309451f8a8333b328a1b3c08
font_02_sfnt_off000132b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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