Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c0e47a7b24e5fb…

MALICIOUS

PDF

94.4 KB Created: 2021-07-07 04:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0232f27f19377b43b57bbf2a8c1cd29f SHA-1: c4649f9fe285b7c733e31d7d36432b14a34693d5 SHA-256: c4c0e47a7b24e5fb04dc54020e598faf1ad1d251ab90490434bc832da5087743
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm nature suggest it's intended to facilitate initial access, likely via spearphishing attachments, leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/d24595a319638104471a580546d6b55e/81289841862.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a3b51b0a1---savupowajowexomopidutaf.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/qconnq84dl9nh3k9puoimbbjcs/dimekegubase.pdf
    • http://anandamsanyal.com/userfiles/file/91180878163.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093044584838---21618133517.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/neveki.pdf
    • https://infypos.com/infyposcms/media/95612795158.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab6e2aff99---25848557925.pdf
    • http://vietkinggroup.com/uploads/userfiles/file/8289479252.pdf
    • https://foodvellythailand.com/upload/files/51136369429.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075df2df1b24---voxudesuredolatasube.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608162b0d78d8---rosodinetikegititoxukofu.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ca2b248820349061dd30919a54b8145/kudipajukidiwon.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607987848a6f8---66062371738.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a8267ac0a---porawa.pdf
    • https://tourgardan.com/basefile/tourgardancom/files/kuwulopavaguzame.pdf
    • http://www.aadhar-interior.com/userfiles/file/bodibekavonesazukog.pdf
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/buwoxavefovoduvan.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e211bc37d---dupenolukuk.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/b77ehrg7vnt652m8kpplmhnmr6/37127502619.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/8b8fd92812f6c5e7af089816b23770f9/63619518773.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/830176ff49aa49ed83ed1692d21e976d/10611954254.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c263d8856fb---6430573330.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/6jkhda7ub3bv0e02h4l0trg56j/51033647691.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/muzubiriranogaxopako.pdf
    • http://eaas-journal.org/survey/userfiles/files/59169957964.pdf
    • http://yuha.be/_files/file/71354705908.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=partition+of+self+acquired+property+of+father
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f52.bin
a0c87aad3ae9d3d7f4d45d2ce8dfcaf26770af4aa1f9b0b78f82cbd4ed7e3fab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F52 16588 bytes
font_01_sfnt_off00013a4a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4A 16792 bytes
font_02_sfnt_off00015261.bin
9dddcc2440db58704a2a40e97b75999e17d9f9f981741c25de917f9b01e961f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15261 11080 bytes

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