Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec142212ae8c08a8…

MALICIOUS

PDF

103.4 KB Created: 2021-06-28 21:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53114c0526f6135bf22850748fc0bafc SHA-1: 12bea81f1f4845a379baa265575f16c99021ffc4 SHA-256: ec142212ae8c08a851352b0ea78032eb9bc954c25773fb9b87751bbcbca2ae2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to WordPress upload directories on various domains, suggesting a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/aad2cb724762f6a7be0df010c1d4af95/fagokerexedisimizoxega.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/c51ilks30h39bn2g1v0g53nirg/87629175894.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/36do5e1rlnpner0u60n00jt5g1/jejexivovapufuwixifod.pdf
    • http://xinyaoqiye.com/upload_fck/file/2021-6-20/20210620124416212908.pdf
    • https://capecoralliving.com/media/file/23100957895.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfac16a11a---pelowoferelari.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68734594f6---rusazimuteto.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/recn1crgc60ngmlel88j1rvn92/tubejilibizutetetof.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/cdadf506460f4884b5beadb9cea383e2/21434381151.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/4949d64b5924d9221c6f2a6c345e7f88/reninekajigokebolobi.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/a64384283910461a0902a9ccc2e236f6/42535622003.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/laebsjmbs5i9p9tcj6hor03ah6/48784283362.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/e433ac2eef042222d77d65b4cd4fc204/91855275202.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df9f2c705a---46606476878.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/sps0bn476gun9863tl31i6q60e/finisisepazu.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/89088c4a949a3f865d35d7f36b84d75e/29037094710.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160914c7153080---nokunafojuxopalimejupef.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ri2mol4skrk0gmodpn3vust1m9/23824592898.pdf
    • http://nextgt.eu/uploads/file/mupuxuvivizapurasug.pdf
    • https://condominiobrisasdelnorte.com/userfiles/file/72855269824.pdf
    • https://go2germany.ru/files/file/xarafigipirix.pdf
    • http://baraanduliaptti.org/userfiles/file/23593271769.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ping+pong+court+dimensions
    • 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_off00012e87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E87 16792 bytes
font_01_sfnt_off00014699.bin
a320f2056243dae3f09fce3a06ead9e610f9dfba63d268cd9dd97ae277d5782c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14699 18692 bytes
font_02_sfnt_off0001780c.bin
449c61caf5c5b926bd758684b78ee220b1353f29bbe0527e34da8d8b563a9fa3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1780C 10752 bytes