Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4abce7eb5a5882…

MALICIOUS

PDF

84.3 KB Created: 2021-06-25 18:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8cc02514c220a89c07bc4b807c638d3 SHA-1: 5b9e81584b5067d00d8a9850af1d2e3e0dc9e7b3 SHA-256: fc4abce7eb5a5882f15836099ef15cc5a567ec7244e096d4dba6a47a9acf9cb3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, which are likely used to host phishing pages or distribute further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially leverage SEO tactics for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5899783ed8---5602055102.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/a7b1a84f6ed0fb72563fb6b1f12a15b5/16583839725.pdf
    • http://samuiluxurytravel.com/Uploads/file/20484748204.pdf
    • http://alpha-cp.com/userfiles/file/zagerafifiwogosobiza.pdf
    • https://room12shio4.com/contents//files/9115801650.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/b9d1091d08ec2fa8450ce81007673eef/gokonafafujexanafunuduz.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/69a6087dec8051493628d626f2ce7a0b/42042653370.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/6b5cb8a275892e44687c35118c9abede/67910809211.pdf
    • http://circolonauticofavignana.it/userfiles/files/laxemeg.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160770eba7dc59---18759695366.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f15cb0df6d---39089719700.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/2ee7f036a9eafce1478f7e38f97fcb4e/zizexagapogojopav.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/17402630619.pdf
    • http://loveperfectionschool.com/upload/file/57986826529.pdf
    • https://faltprasten12.se/anvandarbilder/70/files/89513200849.pdf
    • https://angkortaxiservice.com/userfiles/file/gopejabolen.pdf
    • http://ash-graphy.com/userfiles/file/jusub.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/68ijrldfvgialbkg79uvj4tclr/54495929102.pdf
    • https://alshamiltrading.com/alshamilfiles/file/soravutawigawoxepogexo.pdf
    • https://travelsafeway.com/userfiles/file/dewadabenep.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf8e5e07d6---45572822865.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/b1f50c57c7f26e3ff83d8309be9f2ca7/fixorukasokidugilagux.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=abscess+on+cuticle
    • 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_off0000e812.bin
169a1d7c423ce963b9bb4e15ecd46e0feb3557acf27aba120e219ebf8e2b9a91
pdf-font-stream PDF embedded font (sfnt) at offset 0xE812 10180 bytes
font_01_sfnt_off0000ff0c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0C 16792 bytes
font_02_sfnt_off0001171e.bin
d1b1e307625808895561f94e012907381f4007632745dc15318c2535d546c19a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1171E 16796 bytes