Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a62b895d3e38e23…

MALICIOUS

PDF

72.9 KB Created: 2021-09-16 06:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1a46ed59672821c558817e2df7080516 SHA-1: 90597d0d8dced996754b70a09389fe0c031ed9a4 SHA-256: 5a62b895d3e38e234f95fa88aadab1b7cebf2d00832f4fff918c9a5b552675cd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to potentially compromised WordPress upload storage and other unknown domains. The presence of embedded URLs and the overall structure suggest an attempt to lure users into downloading further malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfacd7165d---28134326227.pdf In PDF document text
    • http://seksdagen.nl/userfiles/file/tamaxupumabewoke.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/genavilazijawu.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/56244534397.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/36093424167.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/7356500789.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/bugoledojukejori.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccfdd57e38---95690635739.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/pibedidalomubomuv.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/lepotazu.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///13759303108.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/posofowogatep.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/mimapi.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/wejabip.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/defujududenewele.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c545c4ef37---86300162450.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/40942050589.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/4839362657.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/89419251866.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/gosafonobebopalavetumosi.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc0a58734a---pejavuna.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/57427535400.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/46701970091.pdfIn PDF document text
    • http://runhouchem.com/upload/files/16798704107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=before+sunrise+subtitlesPDF 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_off0000bbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD407 16520 bytes
SHA-256: c5825a33e70b9e990154fce4764eb056ed281f017014c0b266640497d2fa2498
font_02_sfnt_off0000fed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED8 10340 bytes
SHA-256: 77f6516a23d87cfbcc4e661014c541f1145952089c4b84d737e8828dfb9848ee

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