Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab34953655c7290d…

MALICIOUS

PDF

82.1 KB Created: 2021-09-08 00:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4e2bdb28274d5785664975bda9544abd SHA-1: 17bf446f1290d73313a5eb601771ff1b027bbfe7 SHA-256: ab34953655c7290d2035cf1f86099ad41be0563bd53a693603233e8f82697da3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on potentially compromised WordPress sites, with numerous links pointing to disposable domains. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fde1e4e68---46460655390.pdf In PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/hsq3l2445oleddp28ukj9ddoi6/lerofum.pdfIn PDF document text
    • https://blogsma.com/files/mavamaxitipejusopikufaki.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/laganurasazizalot.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/gdh4n9ta66fi91sjcbtie7bslh/wubapesitotupu.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/75017283588.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160781186e48fc---90744769557.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/5ae32c0edd571e4be46a0b548ed01871/wepenopegomovonifa.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/161218d2a5433a---17461947947.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/32083034157.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/wamajibeketotomato.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161274ccb2b178---nipis.pdfIn PDF document text
    • http://goldmustang.com/files/files/74370597463.pdfIn PDF document text
    • https://himanshikitchen.info/viking1/uploads/files/41838089329.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160730d9127e50---ribapekumutixipo.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/92320767408.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/9a22c5f9132d24158506d7d48fe0b73a/rafad.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/renubanebi.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/3845572219.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9edde910f2---tunejizekobedike.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/gipegem.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/19379144734.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/subigilarus.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/20970832982.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=spoken+english+guru+pdf+book+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD374 20272 bytes
SHA-256: bffbe6a49e391aa0d5988479f986d22174af455e6580ab8accfcdd253b13ab72
font_01_sfnt_off000108b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B7 11172 bytes
SHA-256: 7bffee864dbea0a0a2a9fc57c5b1b963930e52b14d815a19ce1af3de878d10fd
font_02_sfnt_off00012260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1