Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f08fdfdab68472…

MALICIOUS

PDF

75.0 KB Created: 2021-05-08 06:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0126f139669e07476ced69be5e9c37d0 SHA-1: 432104953b42d08f3f5ff1af16aa39c8c754d8c5 SHA-256: f0f08fdfdab68472fa2ba1bedb7fd78646dbc6f590b2e4de9cdda0cb61a08e9b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the detection by security tools indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://cructi.ru/uplcv?utm_term=android+6.+0+1+release+date
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6d18dd47e---44423292171.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084003f4f154---80870689348.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/135030392707928eac693c5407ab0f9f/fujugesugil.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080523cd4250---79834970220.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/dvgnm0be3jpue81d3m29egh3nk/jixitidiwoxomojure.pdf
    • http://ackerviewguesthouse.com/userfiles/file/81237175779.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088e06164f70---14291237501.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e81ce3325fdf28c8d5e2a3071358ffad/ziwopebow.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/e0eef306998a2cf5693a66e1d6ddd58d/47393028218.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b52153e47---96020589115.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/000e35910dbb4a14a91c1c1ce9e5806b/kuzimafagodeduzotelaz.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094af1a20405---jedasegawetani.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/a86f6e153a044b28a3c423b64818f988/41173678375.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093db6d1ca37---47090395243.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1b925c129---50495996109.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/8e6a00cf33e97725974b3ba3c423ad02/5662616853.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd5957ba86---mejikeraguzotidalep.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866f8962a74---67809056788.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5e8.bin
60b39e603984f95198ae9025ebaeac8494a68229d3b7de151deacfbe3cf0141e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E8 5188 bytes
font_01_sfnt_off0000f7a3.bin
cd63cbcef2202247916b68a1e1c9fb2719048b3920f769bc5d7d050b4f65a819
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A3 12048 bytes