Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f6c0f48d4e3716…

MALICIOUS

PDF

81.9 KB Created: 2021-06-29 00:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e92ec94caf95bafabca1e233f24ef17 SHA-1: e51f8fc1d4dae3a5342debf49e81ce8ce17ddae9 SHA-256: a0f6c0f48d4e3716120151f790afeb260bd3162f6ff2c7f69a3d79340e523fdb
164 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. Several heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content. The presence of a 'download button' lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=t+chart+template+word
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a31bb18bd---vujejurefawomomevunok.pdf
    • http://fritz-fahrlaender.ch/download/60716380617.pdf
    • http://mstreatmentadvances.com/userfiles/files/mogunuzugumib.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607129db19fee---tamanazuwakufutow.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b302c809cc1---71141722463.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/oh19b5q71opglkrf2b0a8kbaa1/14775534507.pdf
    • http://xlsferrosilicon.com/d/files/gukumegabowarolu.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/a77bebabb814885fa87dd9f78771ed4e/zatokoxalaf.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/a161d1dc00dce803b677d615849e4abc/10499184667.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c88424916---zijimazunuzobifefudukop.pdf
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/44020304636.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c56647f2dd---kasegod.pdf
    • http://nwatchonline.net/userfiles/file/nowuxabusojojarefobagiw.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a1itbd84nah76ic9ghp0rhsod/90372460205.pdf
    • http://reutlinger.pl/userfiles/file/xetag.pdf
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/piribedizat.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3856a53ecc42438d27127417e8898e4f/womotufalakijajop.pdf
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e753ed0b24---22184664847.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/qfrpgq6as1cjesgvies2q4ab81/86669926096.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/4fc599499250b42b1fc05417bcd833f1/96786269153.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5454204be---tupivikoxito.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a3c8bed10da4fc34ac46b34ab1ec3da1/pupozu.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/gmloq5bjuku9vhpkg8g2483p65/20260583799.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609229e8639eb---kuxajerap.pdf
    • http://esrafisek.com/images_upload/files/mukilevumofogupuxamal.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/9a81bd6080832443aa550bef9ca30a65/lidovusupedasarodem.pdf
    • http://stinpo.com/ckfinder/userfiles/files/lareweb.pdf
    • 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_off0000ddf8.bin
1fdcd8b89d052c8c4707af19462115969ea5c1877a93d27107df6f5fe9749ef3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF8 10464 bytes
font_01_sfnt_off0000f5d3.bin
df0255e3ea510370f8ffa655accdd700d6f2cd092a9dc6b943f524388593cef5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D3 17108 bytes
font_02_sfnt_off00012236.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12236 16792 bytes

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