Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3bf4c8338153c83…

MALICIOUS

PDF

92.9 KB Created: 2021-08-06 06:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4d319addcb409b20951a0969b57aea3d SHA-1: 2a8765f1364e0b0f7f060dd17995f49d7dde74fa SHA-256: b3bf4c8338153c83a06bd6fb1402829e04d71b1f62e5a7c634dd37ae3b24b546
124 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links likely lead to phishing pages or further malware downloads, aiming to deceive users.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4066

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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=how+to+avoid+emotional+barriers+in+communication PDF link annotation
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf85cd5cb32---reniso.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b74520e4707---44515476031.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea4a6bb331---jadiwixumabofofudi.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/28331469597.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/8f5db351b4e4fc191cdcb38498c62c76/24738978295.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202161011090.pdfIn PDF document text
    • https://goodline.by/userfiles/file/63535734391.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/vanasusesegokotumifavego.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/15839624103.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff25606ad0---kanaripemesosomusa.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/33133843002.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/cbe667cd738773a00210bc6372f04e8c/rojezotuvafapujidodare.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c27390355bf---gujirepabifobafirizifi.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1b44a50773---8939474294.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16073cdd810932---44276730722.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/geziju.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/c993f8512cb6e9f183471ab0890fd23f/2167207026.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/kobuta.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/82373623007.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/640494ea0ca03daf47a272d5c41d4af6/31471863353.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/9325653551.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fa80cda804d---mipizinefezig.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12762 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F74 17588 bytes
SHA-256: 2da51f3c8fdce1258fef913498872be77be71d485f64a3e102352056b99c401a

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