Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c7ea1f46936848d…

MALICIOUS

PDF

93.6 KB Created: 2021-06-26 11:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0ef412ab6e8d6960263f646263fd537 SHA-1: 679ee8ffdcd8012151f66ebc3d9f87f3da18207a SHA-256: 2c7ea1f46936848d2e72e069457ab97dd180b8af4cd7caa90703ce9913ba8d3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm behavior and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.ecostroyservis.ru/File/lelelejivafotoxi.pdf
    • http://asckhn.com/acskhn/userfiles/file/gemafasevu.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e3ec6a412---mepewopinefaxabijex.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa7e3c9d2---gopemera.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608945c29e83b---xazejimafimigesixot.pdf
    • http://ahs1966.net/clients/f/f9/f93f52488d971b5f2372adc2bdb16541/File/7296486552.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/r7lffp3bu43oh9589tp86mtdfl/17261239053.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb6610780c---nomutelomawaki.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/jalodip.pdf
    • http://charivne.info/images/file/kemavabilupexase.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2612a463b---pinenajubisigabu.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a6d2a1640---palawoxetamijatik.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a093281572a---kizova.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/3eb56dbe0cf53de24881c0f1285168eb/30985747902.pdf
    • http://historia-bfured.hu/userfiles/file/59042873212.pdf
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xemajujokidetup.pdf
    • http://yakutiaprime.ru/SITE/files/editor/file/11691941847.pdf
    • http://medicaldistri.com/ckfinder_files/files/mitorurijipisez.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3dc60cf27---lavalimimuxopatipigomavo.pdf
    • http://pnmanagementsolutions.in/uploads/85087728565.pdf
    • http://greece-ex.com/images/blog//file/dozivafinenufaro.pdf
    • http://abpaluso.com/upload/file/fajojabaderi.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/cda148ba91c7b66e4b87a87945c072ca/72684294567.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/8763726477.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=epic+bengali+meaning
    • 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_off0001041d.bin
efba31746635b845703b83da61dcc0f424abbaa2f7d53f564554a718bb57d69b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1041D 21376 bytes
font_01_sfnt_off00013a03.bin
1b31ba508a07db1c786bd7b1e6dbc3901b91a0b217f116a978c070aa7830d8ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A03 10352 bytes
font_02_sfnt_off00015118.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15118 16792 bytes