Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e178bb342ce3e6e…

MALICIOUS

PDF

89.0 KB Created: 2021-06-27 07:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35a27e58992e55dac5034fa74147ab33 SHA-1: ba3c31f28d87e6c8cc0f11627e94a239aac7d6aa SHA-256: 7e178bb342ce3e6e5663d0bc967435789ce346dc3d419fd534ee985a0d4ec349
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Static analysis revealed the document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, which are commonly used for phishing or distributing further malware. The presence of multiple links on potentially compromised infrastructure suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a6c0cd72edf252016853e6d5a0b19f3c/kitirepetazumajiwiriwuv.pdf
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rususelojoxix.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e7b57746c---61587289837.pdf
    • http://fiumevivo.it/userfiles/files/fakulobanol.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804c72eee0d---56854037284.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1678269b2a---46451615315.pdf
    • http://tlxzkj.com/uploads/file/031122259086.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/ded269f378738368fe9e68255aa8a939/50004985622.pdf
    • http://shophouse.info/images/files/forawa.pdf
    • http://gerd-pollak.de/userfiles/file/niwizesukijijamedatelapi.pdf
    • http://ekolojikweb.net/upld/userfiles/file/xudiguz.pdf
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/butubepebabenoxumofedebo.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/950910888f857c4e2052fdade13d0a6f/30487443569.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54e968981a---rewetumesid.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609015b9d13ef---mulujodaxobaxedutegoseso.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073df003ddf4---64235799903.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd29089ce9---nixodogu.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/803ac1cd4ed1da2247754ec9550f19b0/pumixenopokep.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9264514317---xofewanuwel.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/c04kboqr4tsnpscvf7gg51usfv/laloxesivibak.pdf
    • https://airflow-skateboards.com/upload/file/44847196503.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094355e5bced---54525968289.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/7de10c9febc8f6f3e3569f39918e84dc/selelapetotuvolikavorazot.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/luzazejujamimelamoriga.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=section+179+deduction+rental+property
    • 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_off0000f747.bin
33e3832528c5c903d68ffe5f57b92a5927a5e7169ebc51691ff2866a913047ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF747 17368 bytes
font_01_sfnt_off000124f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124F4 16792 bytes
font_02_sfnt_off00013d0b.bin
4add4502afba7b90590126df616e9011e9847c700ccbd1947ae13a14a91cdb24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0B 10896 bytes

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