Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4c36e47bf01d6c…

MALICIOUS

PDF

101.3 KB Created: 2021-06-18 07:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: f4551a73c416b572caa4629d394675e2 SHA-1: 83668772b8dba8ca898c21232bbee8543e95b372 SHA-256: 4d4c36e47bf01d6c9f104277ac9ca0317dcb9f84cde489f172e121f4f819ef08
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host malicious files. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of a "download button" heuristic and the link farm structure points to a user-driven download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/71f5a50c35f7e3d5b576b0eecb6a2dc7/95052369289.pdf In PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968f00be279---milopinelofekare.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/55g2n4obkioe6iqi3214n3pvh4/1563181414.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/94fbb1ed81b03fab74b463af501eb57b/bodewab.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/77384d1dcdc7bc48a0702dce25bba712/gapidasopafubovidejaw.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/99cjt9ag324vvt1g76f3bbt833/94564652739.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/f39f95e87338b971badd57af3bdee3a2/81582391755.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce5ac0ad98---vajozinubowutop.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/14221883387.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/supamifetatupif.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/kozut.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/6ff96658e75dee7ed38c550738cd2c38/wabajusigomesawarero.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/98655841994.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/suworilisagerifubufebagu.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/svuva3l8lr63ohq1db2per5l1c/warukamikibibor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=firmware+tx3+mini+android+9PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51F 9080 bytes
SHA-256: 7b6e885ca9d1ad439fcf7946d5dd1f0cd6c52cd79d510118da9a9a1fe0d0644a
font_01_sfnt_off00011317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11317 5196 bytes
SHA-256: 34ee61181261e27cf6cddba4a2b70f459d4139271a31ce58a528ea82862206c3
font_02_sfnt_off000124bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BD 28024 bytes
SHA-256: d62cea16b3707eaa43b294ff3fe77608df856a92d115960d6e23f2acc0e4b4cc
font_03_sfnt_off00016313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16313 21136 bytes
SHA-256: 3ea0002b069b8cdf0e53aefc44132fc758e3fa8f5e29fcbdd0a3a9c64f2fb934

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