Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6734fa1264ed5f3…

MALICIOUS

PDF

79.6 KB Created: 2021-07-02 20:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fbe0a7bf5d715cd5fcd40c8a26d4cf20 SHA-1: b615203c12d7baacccaa6a33f71adec1f63f9aeb SHA-256: f6734fa1264ed5f36ceeb7d5cfd934dbe937ad048b7a2058a76b7caa4777d860
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicated maliciousness, and multiple heuristics identified the PDF as a link farm hosted on compromised CMS uploads. The embedded URLs, while some are marked benign, point to a pattern of hosting malicious files on potentially compromised websites. The document body was unreadable, but the structure and URL patterns suggest a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/8406c906520040eb5dfe9490c564b2c9/rawuwumugalaxaletusubunu.pdf In PDF document text
    • http://bensonlandscape.com/editorData/file/risotuseserepipegu.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160832e2aa8748---69151660527.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a551e18b6e---71139837270.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a85e7e6c07d---64164825018.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090f15a1a6f5---xoxikajilemeru.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/jofuva.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15b576c7bd---37490339769.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0513343e6---53639484543.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607219a6cef5c---54894743587.pdfIn PDF document text
    • http://renovator.cz/files/file/gezifoxuzupotiruzuzi.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6afb7448c1---10604920540.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/66e1a2badfebea6fedfea74191a23efa/69546543510.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ba71eb596---dowudixaronigexamukiwi.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4506dc225---lesone.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/302e2c2c45953aed3cb5af6682200fb5/bovojixak.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bc07921fe---rawejikorofojulapaxu.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160766e69469e1---jubawaxojelumiz.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b373727b44c---82211150736.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/37840928563.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/41172660344.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/81254715537.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/4508ebc9b724d995ed0ad8dbac749a70/ropavuninobumos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=state+space+representation+of+lti+systemsPDF 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_off0000d50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 16628 bytes
SHA-256: 97235e8381389af33d3b901f293b8fb64a50ae5c33694c5e1d337d8d567d1347
font_02_sfnt_off000117ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EF 10828 bytes
SHA-256: 368a7ed9452e7d356f3432d221e5a6b20a6cfdc5fdcc7172d7ad576a0777e290

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