Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ad43651a0bd8a9…

MALICIOUS

PDF

78.0 KB Created: 2021-06-28 22:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 537a7d4bb88070d454df6e04eaca32c3 SHA-1: a66ea5d8b31e7f36c743aac1ebf9c6d61f216ea9 SHA-256: b1ad43651a0bd8a95aba0bff73bf9571372571001cac7c1cfd971ac70abd4acd
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Multiple heuristics identified the document as a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The embedded URLs, while some are marked benign, are part of a larger pattern of suspicious link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9ju3136pt9apa0if7ulnsptu85/morejaxudilipiparitinil.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/e52ljgrrf271d948mqmovrlrtf/jotibugigolimekezapup.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609286aed8e74---sawidukilisorifupetiteluk.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/6840c53b23fe82df7822c4be98acf10d/depetufaxipopuz.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/76a3d3a7f1974b95cbbedd11f5c7dbab/88584049114.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16097ad1d10acd---volopewafapemigizakure.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/09f80bf8eed3d5b7277d1136e7270276/93077032055.pdf
    • https://mm-podium.ro/userfiles/file/38023676422.pdf
    • https://asi-filter.pl/files/file/lorijobokudanenadarogi.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/50878900915.pdf
    • https://laflammerouge.ch/userfiles/files/12501474324.pdf
    • http://laweasy.kr/userfiles/file/tametalibisejinavafowiw.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/cbbf5a85a9a2ee1dd193481c72d44d08/53433088121.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e06dd4968f---wugar.pdf
    • http://aircond.md/upload_fck/file/87162297934.pdf
    • http://jarauwerdaenzn.nl/userfiles/file/59902776561.pdf
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/dujumerawifivipupita.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/37e7b907f05921a14165cf9ff8cde5e1/37731555207.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/6atgrn8pom49l5up0vt0ah9rd3/vozatidedosobezodulajar.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e525698974---67559662336.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee51364cb1---tumafijivixagoxa.pdf
    • http://solarhomepage.ch/fckeditor/editor/images/file/vimumoresidiropunomof.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=mpls+enabled+applications+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8bf.bin
f0fe38d53df2ce3c228211e06f06f1f94e2995311f45ce30f4c3b58f390b1dc0
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8BF 16460 bytes
font_01_sfnt_off0000cfb8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB8 16792 bytes
font_02_sfnt_off0000e7ca.bin
29b470ac49060f8b7134fb21f0a020107c3e0a9f215593ab9a0e6d2f0056a11e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CA 16348 bytes
font_03_sfnt_off000111f5.bin
ddbd6be79a16316021e2359337a20880416d3ec26c4a5fbf4dfb7091f900f192
pdf-font-stream PDF embedded font (sfnt) at offset 0x111F5 10648 bytes