Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a6a9ad8635f105…

MALICIOUS

PDF

84.1 KB Created: 2021-06-26 20:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 733795d24b9a8a3425e5bff7b120b364 SHA-1: 9820bb2dd81b1f92d1003e02b7492b2e7ae7309c SHA-256: 22a6a9ad8635f105e32c55f7681bec35b583f80de68535576aa35bac4f182722
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/idhaojdh1jm770qn6ruiahspjg/zegezunidige.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cd77dadbc23---4934305405.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/1bfed7783787e019a0bfd5449ab64eb2/rawufekifi.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/p1ku9eoljgn61421qvh8f29q2l/91337806257.pdf
    • https://xanbiente.de/userfiles/file/28701426230.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/26691007230.pdf
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/68191659329.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1740a71b1---xejusitagowovoroxatepako.pdf
    • http://mbcasc.net/imgs/file/1871383088.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc4750b04f---suzoxen.pdf
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/5953a32acf2c19a749eea094c362eb77/kawululef.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/3b2udhslo60lu9hpnnqudf8oqq/621606884.pdf
    • http://centralgiving.com/media/userfiles/file/83665616352.pdf
    • http://thaoduocquyhiem.com/userfiles/image/file/86735005418.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2817deba0d---98008174171.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be4f093668---13972231483.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15817552c4---42206115735.pdf
    • http://sakaryakasaplarodasi.org/userfiles/file/66355400136.pdf
    • https://sensorservice.org/userfiles/file/jagiwutufegidegaxi.pdf
    • https://signika.pl/Upload/file/gagofezefija.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160aa85d2e055f---76841528670.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/hr13fv0fiqqcmlr3fj0kqgb787/pixalulobivavipemuxorumes.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073683bce7c8---rubutorafosotapumudotimam.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b024d7a17d---51518597478.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/ukfski1hspeh8niab3gc9sieuj/92771455459.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=bad+smelling+belly+button
    • 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_off0000e712.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE712 16792 bytes
font_01_sfnt_off0000ff24.bin
a11e24229fc849f3be3dc10042d1db49562c831b4474b4db2e5874d9f950f4f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF24 16140 bytes
font_02_sfnt_off000128c3.bin
473d5b8c6a841e2e7d544017100ede8e0a179a784f349941c9ab8c5f58d23162
pdf-font-stream PDF embedded font (sfnt) at offset 0x128C3 10896 bytes