Malicious PDF — malware analysis report

Static analysis result for SHA-256 58bb81022a9d3367…

MALICIOUS

PDF

108.5 KB Created: 2021-07-20 08:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7aab4c69eade6509f4625401ca1deb37 SHA-1: 892a17b0c651a0d80ca36f466baf4536e674427e SHA-256: 58bb81022a9d33670065b8b8c67ab0baef1ce0a0c8c16f3c37ac9567e27cadad
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to host and distribute malicious files. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

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 http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608266c0ad8d9---wimamenafuxinebojelojipo.pdf In PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16070872a4f758---68111617358.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/52873966778.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fcf0c1bcb---60014475078.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/sesezuwo.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/7jpdmichfhbngsgnkj7oarbi7g/9602987849.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0723279001624900660.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/pipunumebonipojeg.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160745325ba6a7---36230185908.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d82f4ead97---bopodupogapopa.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/85c7ae81a89cc618b38c6aedae1aae2d/53240410689.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/puviwik.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/39674672304.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/jidejerevegutuloniru.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/91384829697.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085410dc0dce---76105486919.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/30148742611.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/94230983312.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/75409457723.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/12509910874.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098341e0c41e---14846638431.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ca5cdeaac58---54593784855.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/resateginepeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=in+the+vacuum+the+speed+of+the+electromagnetic+wave+isPDF 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://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_off00012312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12312 21008 bytes
SHA-256: a84dc316e42197733b5b069398a88370c21f5c0d4ea3c742ecab95fc524503b4
font_01_sfnt_off00015b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B7E 16304 bytes
SHA-256: fd831f8a239d989b17d634ff15357c15abceab4494fee6227fe5cb1b70c826aa
font_02_sfnt_off000171a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171A0 11272 bytes
SHA-256: ac0f9530be764bbbb455d937465524ac754a320124af363ed9d1ab83cbc31198
font_03_sfnt_off00018bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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