Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d16caaa1a44258…

MALICIOUS

PDF

95.6 KB Created: 2021-07-12 17:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 940c273c143c4ace0a51cf4c2c1d7e80 SHA-1: d95af2d7a7bc7bcf817efa0fb4832e71df3290e9 SHA-256: 59d16caaa1a44258f6df24758ef2e78c65b01d3a4aa29ba971e5293aa1a7ecb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicative of a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for credential theft or further payload delivery. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://allytemp.ru/uplcv?utm_term=application+letter+for+sales+attendant
    • http://scales-center.com/shop/fck_file/file/81610854462.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609288f1c45fd---19028323811.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2f66101f51---mivoziduwox.pdf
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/svlglsm0n3smfudlp64ahmq8mm/29975628518.pdf
    • http://koszyczarek.pl/userfiles/file/9728398725.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/9fkom0npvpkp9cercjfs4t08ap/komenotugikibodifedavulox.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/pc4ioms51hk628u5h0ifpuj994/77739626823.pdf
    • https://adepotcustom.com/UploadFiles/file/20210507130425196.pdf
    • https://devcons.org/uploads/userfiles/files/xifososalatusowog.pdf
    • https://familienarbeit3plus.ch/userfiles/files/88346467034.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada2c1845b0---57769246706.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/ac9a7d4e9e16166abbfaae40e3bdd4d2/68455687313.pdf
    • https://activepymes.com/pub/file/kezajikifavipibumib.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/f82d642ab2cfa8bb220a5079bcefd6c1/tixinofopulixos.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/a74i7v5to36t5c46iemi4o8sq2/11185660905.pdf
    • http://mujuerp.com/uploads/ckeditor/files/20210530081542.pdf
    • http://hndgyl.com/v15/Upload/file/2021642355434073.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1c092cfba---28746073292.pdf
    • http://sacoorhealth.pt/site/upload/file/68449291174.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/afa56bdc2957ce638d6d6bc9cf4add0c/vaxizuxamenozabifiwaxose.pdf
    • http://copy2d.com/ftp/image/file/rasitezubijaxodasimudonov.pdf
    • http://vce34.ru/attachments/file/sonibezibinirusigexe.pdf
    • https://cytairtool.com/test/userfiles/file/20210708_22918.pdf
    • http://chromoink.com/updates/file/25035876976.pdf
    • http://zae.me/datafiles/file/desobujamefanoxugatomoku.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_off00011291.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11291 16792 bytes
font_01_sfnt_off00012aa3.bin
dd0f41766c4c6bbcba36ce44d6450fcfbf81e0ba701be4067bef695a2dfe52f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA3 17668 bytes
font_02_sfnt_off000158c6.bin
a731804065ebaa2563b95a79c49e8d1809a03061bdbf7186877434ba4f5f00f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x158C6 10596 bytes