Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7bd8bd45f897522…

MALICIOUS

PDF

78.0 KB Created: 2021-07-17 22:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec0ed088fd1ba57b4be0a8878cfbd074 SHA-1: 615a651852e5b59930ed20074fb873229b51abf2 SHA-256: a7bd8bd45f8975223a1a9a179de24194c593916c2c70d7d536cba011cc7587d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. The presence of multiple distinct hosts and the nature of the URLs suggest an attempt to distribute phishing lures or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/fm9miqbrg25p1schhkppnntf77/sokasipizodo.pdf
    • http://elite-nails.pl/Upload/file/jajafatodabelodedibebesar.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5a33089278---82900442973.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608483ade3d78---xasur.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608508489313c---tutanapejud.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/3eaa981db8353d45597da31af515297a/30923074139.pdf
    • https://aquatrustfina.com/userfiles/file/sijazexojegisis.pdf
    • http://qytbearing.com/upfile/file/31837406065.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/78fd8d1986b56092a5af66c3e6079818/78995297287.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f07eeb5410d---dimezava.pdf
    • https://muratay.nl/userfiles/file/65649641811.pdf
    • http://aggengr.com/uploads/CMS/file/62670489004.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6227cb83f8---kekidu.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160853caa7ace5---benelugilimuwesejuk.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607771670cc52---97549918175.pdf
    • http://fine-cottage.ru/userfiles/file/63569141335.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cabb9f8acb1---davuji.pdf
    • http://nineslash.com/user_file/file/sakupidabobufezubidivid.pdf
    • http://paroissedementon.fr/upload/files/75386113439.pdf
    • http://fusen-es.info/yamituki-n/uploads/files/33285287783.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/6e0bfbd944acf07843ef767d184677c7/60359922075.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/990tvh2g5p2r00va7b16bhgg91/81649286566.pdf
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lelaw.pdf
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/fawes.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b313e48f467---fevilimeseworek.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+mews+kenmare
    • 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_off0000d070.bin
e8b5707396f2fa886a068b4d61ca9584fa0f5a68c08177ae9ac95335bd9e66ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xD070 17040 bytes
font_01_sfnt_off0000fc62.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC62 16792 bytes
font_02_sfnt_off00011479.bin
f92a638b680499ec0402ab16f8a107efca4f4fec1961c8fa4b53a016dba13754
pdf-font-stream PDF embedded font (sfnt) at offset 0x11479 10160 bytes