Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e9084fd1e571c8…

MALICIOUS

PDF

77.3 KB Created: 2021-07-03 04:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8a524ccfad75f359dab7fcf65f6b96ce SHA-1: 65c765c525e430f6ad8d6b8635697ea629e2fe72 SHA-256: 36e9084fd1e571c83f5a5924a2b8198f2bf5d295a042d0bedce46c130ba82661
176 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, many of which are configured to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple malicious URLs suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab9cc08a5a---vesemesapexokure.pdf In PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765e2138eb4---72986159799.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608680baa9dab---31445762085.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/kojukurewusirini.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607bccc64cf43---38813397957.pdfPDF link annotation
    • https://barcelonacentremedic.cat/files/galeria/files/94544958957.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/59926154032.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/irjfplpi22jkonblgu6titea46/noxemanakupubupogabitexuv.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5d7d9ff2cdcfc80e0ffa2249b5c8bb81/kanuzepakamil.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4feaa1bded---furolafavagosox.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/7dee3b0dca4be10078278ecdae7d506d/vinojulewosiwe.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc595bfd50---25109080865.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0419cc4953---99042555657.pdfIn PDF document text
    • http://moorheadhigh1970.com/clients/c/c3/c3beaea4c2dff0dfe15f0c96d12524a1/File/48539516957.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/26733d905369a4a17764a468ef8aceb5/wijumotonajeruwudez.pdfIn PDF document text
    • http://ha-sine.com/d/files/bitofebusewodakasifo.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/nujevejitapivew.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/sivatibukosamazona.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/38edae8afffb80e933513c2d456c5a84/60477650991.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/44957054005.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/5t6rdjcvok08artsa4kv7sot4p/weresasegofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=heart+of+azeroth+upgrade+questPDF 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_off0000cb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB00 10832 bytes
SHA-256: 2dc81fa1536bc27e8cea12379a3335870de595d628803093d7758d1216bcaae6
font_01_sfnt_off0000e395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE395 16480 bytes
SHA-256: abe6300010d4f2d39427993ec38af6fe20d75fdac0a0f6113f9fc335c71c49be
font_02_sfnt_off00010e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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