Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9fac07d4e61c40…

MALICIOUS

PDF

84.1 KB Created: 2021-09-03 15:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ee74e3720a57431db8594b7f89c29ab5 SHA-1: 174012d315a4a9a2391605ace83b71e72ce0a425 SHA-256: 5c9fac07d4e61c40fbee4ff8c5052949f6618b622f186994011904a182c5e2f9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous links pointing to potentially compromised WordPress upload directories and other disposable hosting. The embedded URLs suggest an attempt to direct users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/70893653014.pdf In PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/gimamewede.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e6aa5f69b927dcd1a9659b74c851e5b6/71774882776.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072935a66768---47742033249.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/ptgrqtuhjvintqe7dgvp6h1qbj/6637507439.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/3f002d0f4823272a5e8b55ed917c32ae/26447238188.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/64041457762.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c67345dcf2a---10089079408.pdfIn PDF document text
    • https://sukaunited4d.vip/contents//files/77454787110.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/lagawemakozokoj.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a723ebd6fbb---juxewavovegosa.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/fijijotu.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/dakijuvero.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/deluko.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/dasuxamapomiwoto.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/89179817241.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/12332959216.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/9a6491cefb0cc4f14a0da0b647b93614/97298987927.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16121b7979d2cf---zusajukufitotekasowixul.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/14627387114.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608beaca4c956---vupojitoduri.pdfIn PDF document text
    • http://coumert.com/images/file/xodojudafex.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/lowigewimoxegojekagenirox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=apostol+calculus+vol+2+pdf+downloadPDF 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_off0000e348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE348 17964 bytes
SHA-256: 9195214663d52be6ee49133fc206934279043f437d17fae064924d6b5e7b5ee6
font_01_sfnt_off0001121e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121E 10640 bytes
SHA-256: b54148b0f07400b5ca5c6add6d59a3a5568f3a8a9a606cb894eb7ed2233cf519
font_02_sfnt_off00012ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1