Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8cdc8f884a743a…

MALICIOUS

PDF

88.6 KB Created: 2021-06-25 17:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 840c4fd840887ecff8bf331fcb0bdb21 SHA-1: 644c5d2c81f0247dc3083b52f1ef9ec54947113c SHA-256: 6f8cdc8f884a743a816d80b1839c633687860fcbefaa817abd29ddbf2af65aac
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to compromised WordPress sites. The PDF structure and the presence of multiple links suggest an attempt to direct users to malicious content, likely for phishing or malware delivery. No scripts were extracted, limiting the analysis of specific execution methods.

Machine Learning

  • Nyx PDF Classifier clean score 0.1424

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://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71ecc0beac---jiboferevavejipisapuluj.pdf In PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/ropagewituvilavosin.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/7vtcs15m1049sqspejf7pgmkk4/mupamuninop.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/7r94a1aslv4n6paalfdd0j1sgr/79484714456.pdfIn PDF document text
    • http://becucci.it/userfiles/files/22513217974.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c590cfdb0a1---53597146276.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/dodawomefoniwuzesimilaju.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/30278497347.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/i77s0u552mcelt2b8rh50cf8l1/patazegozegasuwanilixujab.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/58e6921a957698b8c8f6276d6bfbc0c1/13199521167.pdfIn PDF document text
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/26ces680bmjjh0totfgr4htbpk/22727202470.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099edfb9c0f8---6673202880.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16079de46a24a4---86548433717.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/b23f4ecc9df0417b45546617c41ced62/60112634501.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2d62ee56a---96665369103.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/39976474716.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6a2b0c974---38620555097.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/a2b4d04b553c23cb3cfcf6067e5a78fc/nareleleralipamutuzotar.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/30cfb6865901068e9172ed4765fead3a/93578687934.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7e0e71ae6---sonuni.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769386154ac---bibiputevuj.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/676ba96f03e7e77e7071ec0180643197/79273899748.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/17059a983d4f636982002a832b1c8b87/48444664106.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f37481ffb---pivalapuvuzifowex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=wow+classic+ret+paladin+pvpPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001190b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190B 10652 bytes
SHA-256: 7add5a03adc7905ce355c09bfd706afba2e9814e1bdc0537df7cc81e369d09d2
font_02_sfnt_off00013197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13197 17100 bytes
SHA-256: e641d219d8477ca184ecc2fc3f253deb4945b175bdba68be64369240b4c1cde1

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