Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c6db6f2d5f114e…

MALICIOUS

PDF

78.7 KB Created: 2021-07-03 00:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae26328476dc325cf2c4b69224615907 SHA-1: 650a52990346ae100e7a2cc5cbb3d6e69f6f0f6b SHA-256: 57c6db6f2d5f114e055059587704661f651df2907612f8497cabd8e123623c99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various PDF files hosted on compromised WordPress sites, indicating a link farm designed for malicious redirection. ClamAV and ML classifiers flagged this as a phishing or trojan PDF. No scripts were extracted, but the structure suggests it's intended to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa65ecee9d---44469674410.pdf
    • https://condominiovillage.com/userfiles/file/kivinotowun.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/puco05ptqap1vahe5c7hjlbc44/sipubupuragejevogoliki.pdf
    • http://9meclinic.com/ckfinder/userfiles/files/wajuzefafibarurasevanu.pdf
    • http://ecohost.ru/pics/images/file/49260376510.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/fc6d70rm8n3hbcq4seumfp9hbo/49716515213.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/aago8bk4nspsddb4360qodhjsr/55113535689.pdf
    • http://4bzsoftware.com/Images_upload/files/48391491683.pdf
    • http://hungthanhauto.com/luutru/files/bobejodonagupusil.pdf
    • http://ldbell1965.net/clients/85689/File/fupatitipakonuw.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a641b08798---vodolilejavaxege.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cdbf3cd500f---25684693677.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/1b0608c4f38608f7273cb4e80eb9dc43/kufawe.pdf
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/viruvivabenisolelowon.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160738d0ec47fd---55920689352.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160791f3b76ed9---puwazumegejimuxe.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85ac4474b---merorijomij.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/98odtlhm7cu96gflt9g5o7ufei/lilowinakibavir.pdf
    • http://brilspa.ro/userfiles/file///77087452045.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078aec7299d1---wejoxezugogatok.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/fdfa7e764a3e1144618c9c420f40b22f/kawofalebozu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=meaning+in+physics
    • 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_off0000d463.bin
89b6a1a075a4e56f287bfe6ddd6e242e3880ecc7f74f14cdf4fb16918db8a4a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD463 10396 bytes
font_01_sfnt_off0000ebd4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD4 16792 bytes
font_02_sfnt_off000103e6.bin
df81fb64c8af07e572395e5b1a7a6a1d8a0c19a51b7c6a9bab0d45c6366e4ce3
pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 16256 bytes