Malicious PDF — malware analysis report

Static analysis result for SHA-256 91eaa0394fc7af1b…

MALICIOUS

PDF

81.2 KB Created: 2021-09-04 13:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0cb3f49a9d4aef17f9279013e46dbe66 SHA-1: 9333d4b584985f5cc9c35fc446fd415a34c6caac SHA-256: 91eaa0394fc7af1b21ede4918a2f9beedc12785a1b648050adb9573707e650d0
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/v6gis82grsvbt27tgphqgn01p7/89380961601.pdf In PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fda5095259f---73127381931.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/2e1236bc75e1b7395df87dbfe2863f44/wewidafunibemenilelon.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160759990ba0fe---negilisid.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/d3c209a8eb362fdac5d90ffa050be38b/69400562297.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608602a6dd358---82884296409.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703c26b8568---dafobususixev.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091d30d5c42c---zuwodive.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/152583907260c5f356a63d9.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/girubamovuva.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/e8c1d0fe44f6eb933e916a0be6248685/rojunoxinu.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/64813734520.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/mofuxoratomaxawigunavalar.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/36295535298.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/gizelujiwusezekelutufe.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/707e445e7c68eabe7d4c7466da515f4a/78495777097.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/tbn1jl1kbtmnfqp8qluiign7gn/63025853959.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/55882091696.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/214j38vat5flv7jhktneu2s3r2/wizetupufogepaw.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/607cc937e60af3db6d0e6df564583614/57314072384.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/loforupalozaxukiri.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/8d4df46d4e720d34477cdc11aff5bb8a/sixukixukibude.pdfIn PDF document text
    • https://stvorki.ru/files/file/79453970511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=kerala+vasthu+malayalam+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8E 18744 bytes
SHA-256: b32407ce237df00e04d68600dec1b071e707e1905b55d76c65f8863c65d35489
font_02_sfnt_off00011eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAA 10716 bytes
SHA-256: 3b7dfcab3929fd68923d81c33c352e3707d19eabfccd58021a4e4ca98bee26f0

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