Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a89cc1c424fcda…

MALICIOUS

PDF

85.2 KB Created: 2021-06-30 18:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: abf4197161c600a749fa710d126793ce SHA-1: 33641bdabf2e635f4a79119298cfbf9a754468e0 SHA-256: 72a89cc1c424fcda082ba82ba70aea557afe4fd4c3d712c50a40f13268e0dee5
164 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. It contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. The presence of these links suggests an attempt to distribute malicious content or conduct phishing operations. No scripts were extracted, but the structure and URL findings strongly indicate a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d093d66b5---29032315717.pdf In PDF document text
    • http://novussiteyonetimi.com/uploads/file/kagixisedasejofovon.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607489aa94e6d---xutavawuxisesi.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/247qdkr4t6ot7n90d01245qtr3/geninewosewalezamo.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4d4dc5c6e---mesil.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/pekonufuvemajunodugofoz.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/97889612693.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/rujepalu.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/85207762113.pdfIn PDF document text
    • https://siroyensao.com/upload/files/75371040911.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16076de004e3bc---susugijuwezowar.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/hcq9quva5f26peih7gdeih15jk/rewomipite.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/69933587472.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/sebewozetalofu.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/39561851468.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/pobuzobojiwaxelamuruj.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1608231ad6655d---nexesobuzavixizilemaraf.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/de1e80aee3ff71d81b89ef2c03f815cb/vivilezazasuvotimirudexor.pdfIn PDF document text
    • http://taitung-house.com/CKEdit/upload/files/bawefelupajeta.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/nigugezedetev.pdfIn PDF document text
    • https://masihpt2.com/contents//files/34800601147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=olivia+colman+claire+foyPDF 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_off0000eb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4F 17372 bytes
SHA-256: 8f29abe6b6f0d80d0e9f82ca17757f951e96d2de920079d70b7e8b321b7060b3
font_01_sfnt_off00011842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11842 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13059 10436 bytes
SHA-256: f5b48c7fa54b01101e9b6f4f60ea26dbaf6fa166ec1a57ee222ec1e0cfeaea4f

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