Malicious PDF — malware analysis report

Static analysis result for SHA-256 74e2d57691834123…

MALICIOUS

PDF

78.5 KB Created: 2021-09-02 13:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a969efcd566a1a29b002e5b875e8418a SHA-1: 65831f12c88607de4f557e180b11af1afc341bd5 SHA-256: 74e2d57691834123dc0a2a8a1e8912aeb61595d771e932c8a60d2aebee7d82c2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous disposable hosting domains, a common tactic for SEO poisoning or distributing malicious content. The ML classifier strongly indicated maliciousness, and several heuristics identified the PDF as a link farm on compromised or disposable hosting. No scripts were extracted, but the presence of multiple external URIs suggests an attempt to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://benqmusicworkshop.com/fupload/file/kabefaguwapi.pdf In PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f991a3523---tolijawajalujewamavobafi.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/pusulixelimorudezikesim.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/18856779148.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/feravarak.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/26754224185.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd85ca734d---tolujaxekubuxopujok.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/7fih7n6ee6kanoejm00o6cbp22/rogubiniloradetatoziruke.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/92990980837.pdfIn PDF document text
    • https://beliangka.com/contents//files/3367576636.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/qfal14jsiiv57mafp05kqfuokq/ralumare.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/16boi1jqssec5lhk1tuort32mk/wokevesepemokapifane.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/kuwiwotebagepadokubefo.pdfIn PDF document text
    • https://temahr.hr/files/wopojis.pdfIn PDF document text
    • http://abnicum.com/files/file/96255568877.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/oit57itvfeqkf5sgrol7tfl65tag0sr9/pobazopujagip.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/0989j38tmr827blims8v9saoh7/99472639169.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/1365526041f751ca8cf9ac71a526d5ed/47741484946.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/30047177259.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/gulaf.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160854fc8cd68b---20091960887.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/74342bfbbb7a2b73ac9cfc0dd822d5ed/71008910270.pdfIn PDF document text
    • https://osakadentalcare.com/contents//files/45907197875.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f63a0405632---49612189916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=houghton+mifflin+math+expressions+grade+4+pdf+answer+keyPDF 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_off0000c955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC955 11508 bytes
SHA-256: 9e971cd04b882ada24eb511c9e1fe56d008b8f01e7910ca722a82bdb3f798be2
font_01_sfnt_off0000e43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4E 18228 bytes
SHA-256: 0e51119569897c8199e4e649db61d2dd29d875282aecf64d048ed0ddba678674

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