Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c99949543e1ed5e…

MALICIOUS

PDF

86.9 KB Created: 2021-07-31 05:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e54e9f874f4fe0aacfeeb57bffb4456e SHA-1: 163b440ac5b3832c768e47a7842576872a67778b SHA-256: 0c99949543e1ed5e2fe4f197e25756009f8cea83159c5995b85b571b6a529b42
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics suggest it functions as a link farm, with many URLs pointing to compromised WordPress upload directories, likely serving as a lure for phishing or malware delivery. The presence of invoice and callback lures further supports a social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e66f7b97d1---95214180717.pdf In PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/refu4bd2p5vqf0ikdrn87f5vc1/tanolurozanekosekuxabut.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/moxitibitibajilo.pdfIn PDF document text
    • http://ehsclassof88.com/clients/7/7f/7f6c4973f16106f9a1f2948091db50b4/File/9044584678.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/29440004632.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/84130854447.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e18a96d06c---xodokixuli.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/15836199513.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/69987437688.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6736649381---27118436087.pdfIn PDF document text
    • http://ashioke.com/images/library/File/24093053914.pdfIn PDF document text
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/34478185305.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/97550415669.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf03710bb3---vububusagosotilud.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/xofufidore.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/ripamel.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/45473922745.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fc69e37d3856c3b0b0e4f0922ce2ebec/lilixixujapusivesulesebu.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ee9295fb7---41184988933.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59588710392.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/guvizisug.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/56254647855.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/26050511493.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/853451e4a693b697dbdda3f86e745984/89157472574.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/94793005492.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/6a4c9f9c58b7c8c28491a98b938f9ec8/2147419712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=daily+thanthi+news+paper+today+in+tamil+salemPDF 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_off0000ee23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE23 10860 bytes
SHA-256: 62fca410cb06e4f4624888e3b908dfe609ff7a46f23b1dc4e747160d702cc4c3
font_01_sfnt_off00010718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10718 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2A 17188 bytes
SHA-256: 56f70796b81d1401afda730617d3bd11f499ea81bfda474dc797470a6f1bb942

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