Malicious PDF — malware analysis report

Static analysis result for SHA-256 130f35eb0ed4ffaa…

MALICIOUS

PDF

80.7 KB Created: 2021-09-04 15:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4d033492835991ee1fbf6a20ac0dad6d SHA-1: 3d779d4e648fd7c2691f1bfe655caab83b21d899 SHA-256: 130f35eb0ed4ffaae6c2b48808cd33403867c9b45997e4bd72d6cd0bb7a5897c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the primary attack vector appears to be the exploitation of user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://alshamiltrading.com/alshamilfiles/file/rekosujekibosamuda.pdf In PDF document text
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/finaw.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b271b90b483---mavodekibanumaxewutow.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/04fee2cb8c4a3e5f5cdb884539077414/37606138751.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/50267502700.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210828_6FB0C9683EAE72F9.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/b7bb21f88ab312ce5dbe2e3f96c9e3b2/48419513674.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160feb42a8d95a---jakibitemawilotof.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/46034037763.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16076ebcc29801---xobume.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/mupilanejipaz.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/8552497003.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/l2plm055engck1bsosn02pak20/92646775826.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/rgqmp1aor6qrs49l97gufcnvbi/gosowumonenojev.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1229d1e951---tunatoxinewedusa.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/sobufepub.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/7135d175e474096f07a3e7b593eb11fa/29941800825.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/53819804206.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/raritugugujenakag.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/pogirajuwivikifi.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/86902969937.pdfIn PDF document text
    • http://envigest.cz/upload/file/pagepogapizuninimufuk.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/39861670944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=micronutrientes+bolivia+pdfPDF 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_off0000d46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46F 18408 bytes
SHA-256: a691f4a9f9984b1e2d30563d281f7ab695117a7939dd51608d87c695e8704b64
font_01_sfnt_off00010467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10467 10912 bytes
SHA-256: c95377534cc7b7ec890b80f2193a053d6a4958e87b9f6f62e96aae33589fb2db
font_02_sfnt_off00011da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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