Malicious PDF — malware analysis report

Static analysis result for SHA-256 666c10b6cec545d4…

MALICIOUS

PDF

83.5 KB Created: 2021-07-06 12:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9b55162431f909b7d182ae7d1b42e315 SHA-1: e312b32734d390e6b8576ecdd580f9928809287a SHA-256: 666c10b6cec545d45ad883573f8b73363cbcabe4ed28a2137ff815352f68e04e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://archism.ru/uplcv?utm_term=map+of+tropical+evergreen+forest PDF link annotation
    • http://allasclub.com/campannas/file/11480462251.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/ed2fu7okp0ncuhgs13uq2ualvr/61382133947.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a017aa4173c---roxuvasupapag.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/5ab242a76c0b1e11fb7bf1f91c1334ca/lexagileg.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/sadofuserutiwuxaka.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/49538876595.pdfIn PDF document text
    • http://armanetti.com/images/savasotasakanozawaduso.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609493d7c8c52---52604097234.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/konuvulomerajavurowulot.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/7dcfb24e0aa71a26e62e27781fab4165/sovozekoramokej.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/pokelusif.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/tevezusudevawomaroxivef.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/122a63148ef95539ac386eda1ce0a247/jujiwatelaked.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ce5f6c167d94f4ad9e97104091a5e593/webodinezimagulabib.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/xubofaze.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3b3ade6b7---kiladurix.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160778a3e48a29---72193395142.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/15860424212.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xuladuwelerorimivo.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/dulovu.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/115vsrfkovu9ih8b6bnd1tc0u7/30352266922.pdfIn PDF document text
    • 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://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_off0000e37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB91 10712 bytes
SHA-256: d05fc809433f1e94e402f10246b11834a3283495e9a95f5452fdf3585eadcb35
font_02_sfnt_off00011453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11453 17184 bytes
SHA-256: 1ae643cca71a3b1d9c5d94a6ac0c0d9e26350e35b593c779d41433d6c62018c8

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