Malicious PDF — malware analysis report

Static analysis result for SHA-256 af296865b6f6fb97…

MALICIOUS

PDF

86.8 KB Created: 2021-06-30 17:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4dcc047dd3743dad70566c64ac39ba6e SHA-1: 3d19c2604063c19ef4d851213b02d5513a8449db SHA-256: af296865b6f6fb97c517f9369099685788480205ee737236b10c5f6d0eead3c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple external URLs, many of which are hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely involving the exploitation of PDF vulnerabilities or social engineering to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/wedojatudegavuzopetesalud.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9abfcda62---28201803258.pdf
    • http://engroupe.ca/aym_image/files/5525378058.pdf
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/92626373038.pdf
    • http://dzbnf.com/upload/file///21361461291.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ca191e725---34491850645.pdf
    • http://spamsmsgiare.com/media/ftp/file/25365626491.pdf
    • http://ecogestval.com/userfiles/file/7188252682.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a54cfdcaf1---guwakorumesidenulevenero.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/7627826431f716b1b68456065fec6939/62859213779.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6362a3a374---kenekiwidenosabajelip.pdf
    • http://axiomestates.com/userfiles/file/94028654393.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608001ee89006---13316105861.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/09bb66c2664edf5429e3dbed0b6fb1de/xipefok.pdf
    • http://orderkiwicafe.com/uploads/files/68978591888.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607626ad73282---34653585609.pdf
    • http://3xlove.com/uploadfile/file/gexegumem.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/9418d81140923479ebd6c18e8f5ddd82/67341218316.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e7a7457d9---tebadipumijetilefoleguf.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/006555f5849d640a4840d0081e25c8f1/bosigomuv.pdf
    • https://kisikana.hr/userfiles/file/22942619415.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d26c7720fe5---vebawapumepeduki.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d29139444b---5941918888.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a02a8f15633---kupijako.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+know+the+mass+number+of+an+element
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000effb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFB 16792 bytes
font_01_sfnt_off0001080d.bin
b7bbf20baa826aab3fe487690d773860eb774c4600f4cea9efc4c42723dcae59
pdf-font-stream PDF embedded font (sfnt) at offset 0x1080D 17152 bytes
font_02_sfnt_off00013525.bin
833fc0ef181b10e015326f5694e3590dc2b7da1ab3dfb1adfcde1117f36546de
pdf-font-stream PDF embedded font (sfnt) at offset 0x13525 10796 bytes