Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8fdc5525ff47d7…

MALICIOUS

PDF

83.2 KB Created: 2021-08-11 18:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3f5d0999f3735ad268e5fa4c43b5b81 SHA-1: d96ecef6f4c1fe75803c5747564d08fd0a82b5e9 SHA-256: aa8fdc5525ff47d7e36ffbf16734ace0beeac0d547d9693b8adc5601d918c9fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, pointing to multiple potentially compromised or disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/95816468d66f05ad195fe207d276d1ff/14338090103.pdf
    • https://sabunwangi.com/contents//files/rogulajabiredivegol.pdf
    • https://aslimitada.com/userfiles/file/xunetipivotusuvobezidil.pdf
    • https://manuscripthandler.com/userfiles/file/62943932011.pdf
    • http://geyikkimya.com/userfiles/upload/file/53230794704.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/en5ka15jrtsuis1h1ls0rpp561/pusoluresijefiwexu.pdf
    • http://ekhoron21.mn/uploads/files/89108370212.pdf
    • http://maasmartcity.com/userfiles/file/72698380150.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/sa21e593rkh779dob0madk5ean/79194967534.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608405905283f---49840644570.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/2be2e1gha8jn11d0r4qjq09vf0/rotanirase.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b96dfc696f7---zojinudufoxasaguvoxosula.pdf
    • https://rinducm1.com/contents//files/kilaxozomugapaxutuvud.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c66c794e9---2898909474.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607462aa1cd5e---mutidinexutufadas.pdf
    • https://datawire.gr/files/files/mibukinujuvonowef.pdf
    • https://cyberbirddog.com/userfiles/files/fifabufijamejenuwedadi.pdf
    • http://korean-school.hu/hangul/userfiles/file/doratoduronedinoku.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/39b396b22012cba38906c18a88d8d7bd/zunixeb.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084111b63435---55151877853.pdf
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/mosolumiretufeporuta.pdf
    • http://gordostcrista.ru/userfiles/file/97723937252.pdf
    • http://ttccid.com/userfiles/file/giwusevanomatuwo.pdf
    • http://zulassung4you.de/bilder/file/50525224629.pdf
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/sezuvideragogar.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=depression+era+recipes+book
    • 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_off0000e0dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DD 16792 bytes
font_01_sfnt_off0000f8f4.bin
4f1e5e7b0818025bd134291fdacc5ea2023998cb5c3ac0ccbdfef7ae33009309
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F4 10456 bytes
font_02_sfnt_off00011095.bin
802fc73f5eecd98e9180d560f4948fe40c3ae446da3360cd91872c93bcd776b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11095 17420 bytes