Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa12d99f3990f00…

MALICIOUS

PDF

78.9 KB Created: 2021-09-22 10:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d287e5d79f8a2563be34913aa27e2991 SHA-1: 3abba62d00b086a72804bc1455c0dfb99ed3f38a SHA-256: dfa12d99f3990f00f3709e6d6e379d59c9da48531302f58633ebc742a1dffda5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, including links to compromised WordPress sites and disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. The presence of embedded JavaScript suggests it may be used to further obfuscate the malicious links or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garnet-medical.com/userfiles/files/54586195644.pdf
    • http://fabtur.ru/upload/files/wesekiwerusadirufido.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/e7db89aa77d23e95b16d3bc63c1f1714/37886746860.pdf
    • http://re-media.ru/foto/ck/files/bigima.pdf
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/62552955159.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9fvdot22uqce9j5l5pg4vblus/58705744781.pdf
    • http://luberoff.com/userfiles/file/63607280985.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c59054cc0---jutowajuzumeguwol.pdf
    • http://tienphat.vn/imagesflashupload/file/zetukapulaliruzawe.pdf
    • http://chetaomaynganhnhua.com/uploads/files/duwuritalize.pdf
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/xudogojeleb.pdf
    • http://kovospm.cz/fotky/file/nibiporo.pdf
    • http://besteva.com/upload/files/bitolejesujogirezotaturej.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462903f40e2---doziboret.pdf
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/luderebabegonaroni.pdf
    • https://cam-ceeds.org/ckfinder/userfiles/files/41804646806.pdf
    • https://tasivn.com/upload/ck/files/41199314547.pdf
    • https://home-consult.lu/userfiles/files/wunuti.pdf
    • http://neo-net.info/giganet/files/file/84315108781.pdf
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/pibolajuba.pdf
    • http://mitroc.com/userfiles/file/6534305531.pdf
    • https://cafesca.org/ckfinder/userfiles/files/64646434480.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=tongits+wars+offline+mod+apk+unlimited+money
    • 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_off0000cd20.bin
9ca01ca4d360ea52b194c836a024cf712d65cd19dfa5bd86649a8a40ec91db62
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD20 17996 bytes
font_01_sfnt_off0000fc0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0A 16792 bytes
font_02_sfnt_off00011421.bin
62dbb5b9158230f7c82477c94d7467dde748d9dd1f2fb4202b180a109cd6233e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11421 11196 bytes