Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e114ef7c3cf975…

MALICIOUS

PDF

86.0 KB Created: 2021-08-07 11:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 40ca0ed56fe292d6eac74d6f998c61d7 SHA-1: 321a6cc0ee0ff3f2f7989124c7c0017c4e02becb SHA-256: 61e114ef7c3cf9759add16ee3c51224edf14653894498e4de74b8007cc324778
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a tactic to artificially boost search engine rankings or distribute malicious content through a large number of varied, low-reputation domains. No scripts were extracted, but the presence of multiple external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://illinoislivestock.org/userfiles/file/xasezabopekaremikizeto.pdf In PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/5be88f7f0a90914ca9a9527bbda1b4bb/95437634700.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/091952581218.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/tupjdqjpsjici0j99uvo9797q1/rojivase.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/12852695973.pdfIn PDF document text
    • http://endemic-capital.ru/uploads/files/limalemakiruxizowifokuse.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/93048285201.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/godijunorisukogawufu.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/d8678cebf409715a1b66b40239cd26b0/73190785666.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/gapitaxudimitib.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/59876a94b109147e2cc9531626db9c09/lufixozebatope.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/82012571336.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/45711773198.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/gebafidabesigi.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e2084191d8b31c57b082f35b9f03a593/paputibofutigetelari.pdfIn PDF document text
    • http://hkwwta.org/userfiles/94043634579.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/38960395697.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/qbqa0vnctlnrm79gdov7vrj7k1/seduzibozagupejatamulesun.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160724ec939018---5798543434.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/76644202951.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/vafumijogosabotixu.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/tekipipufebaxagonivurabus.pdfIn PDF document text
    • http://zippy-inc.com/app/webroot/userfiles/files/mareloxaresujede.pdfIn PDF document text
    • http://sooclose.eu/upload/File/94275803731.pdfIn PDF document text
    • http://sankofalectureseries.com/clients/a/ae/ae3037074ff26ae8502dacd236f4ced8/File/xelemuwujipojizeku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=balancing+equations+challenge+worksheet+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_off0000ea88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA88 11100 bytes
SHA-256: 1d1f2f8461b25b1b511a59efed743a48a01288e608f5af250d387b00da08b5a6
font_01_sfnt_off0001042f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042F 16780 bytes
SHA-256: 42251f5ef90a5cf9e4995f409a9c3fd7e29f6f2feadfc1b0b6a32db695bc096e
font_02_sfnt_off00012ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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