Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d20037c1b4246f5…

MALICIOUS

PDF

79.0 KB Created: 2021-09-11 09:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 122450ec2b0d0ea85a73551430a6c898 SHA-1: 89ba9124c0f38e5f9c19a1b224cdb2196b31c848 SHA-256: 7d20037c1b4246f554b8bdd4c92f5e6511b866850b13547a058f44ca65a4d1e0
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. Multiple URLs extracted from the document point to compromised websites or potentially malicious content, suggesting an attempt to redirect users to phishing or malware distribution sites. The PDF structure and embedded links are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ghinelliarchitettura.it/userfiles/files/buretobavoniwijoworinob.pdf In PDF document text
    • http://kingkady.cn/uploadfile/files/salozoviro.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/44199577119.pdfIn PDF document text
    • https://basisangka.com/contents/files/71003291952.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/45434421755.pdfIn PDF document text
    • https://airxps.com/userfiles/files/rujimofexetapuvumekijon.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/40737044513.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/zokajejave.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/61731816853.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/7368192690.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/97142249418.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/5626812171.pdfIn PDF document text
    • http://innotack.com/userfiles/file/xesaf.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134af569d756---38055678773.pdfIn PDF document text
    • https://fuoriscena.eu/file/67997705669.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/3dc3202a25235c26afe63de2f7eef856/vipejonikukasixadedasid.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c70c4dcf6---beriwizofudominexegasipop.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/vmesspagi5qmn092qcjuqbtdia/27726976469.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/lidepujop.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/89412122924.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/judufuzoxagir.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/trtjl5lv9mvdvalajh28viop17/lupabum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+1+ludo+king+mod+apkPDF 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_off0000d10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE920 17560 bytes
SHA-256: 93626ca2dcb306464b73c23eb9362547c5ed54a7aa80c4d857f35ca5b4e02238
font_02_sfnt_off000116a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A8 10564 bytes
SHA-256: 2f6da2f735ebfc7bad0e662c7ffc6fa586da7581639b2c637162bbaeeb074228