Malicious PDF — malware analysis report

Static analysis result for SHA-256 8871df75ce4576e1…

MALICIOUS

PDF

295.4 KB Created: 2021-07-03 13:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4c2188c9cd99c8d37e7ad1fca0aa20f8 SHA-1: c0097f79fab8d55c24688142ec16d59561eceded SHA-256: 8871df75ce4576e1e01f37a3db46ce77fd6fd0449bf6d3acbd42ecb6868a4489
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a link farm pointing to compromised WordPress upload directories suggests a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9699

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.
  • 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.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088eabbdebd1---radumotizijunelibuzub.pdf In PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0368055c07---tegutugemon.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16099270319bd3---60681190510.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/9d86a7pdkoo9gsfvemehq0chn7/leruvemakewogogesup.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56de04aa8b---12515717841.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/98953514222.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f62e1b22ad---88402306485.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f6b9071b7---kamefogewuwo.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/27810072190.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/0d48b9902700ee6cbbcedf32e384e978/95767672347.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b04d18e7bf4---43332403788.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160804bf17d07d---31879156708.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d54b6c7f7---26187562699.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/835db40fd523feb3a842649eaf2126e8/1751745276.pdfIn PDF document text
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/8e115daf04ada57e16d5b1aff1d19cd0/42111256165.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608426fe9d29b---befedafexanu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609858778e987---kanupikedalivos.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a6529bc06---44807539336.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/47253687105.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/87017408833.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ecbd32932---kiwusopujezovotur.pdfIn PDF document text
    • http://zerosquareonline.com/file/33004358445.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/eeb0d2b294a00858e4ab7db0e7451f05/98059808333.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/9893fb3e96b3c96590f10c9c2d414374/vixopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=international+review+of+cell+and+molecular+biology+impact+factorPDF 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_off00042533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x42533 11252 bytes
SHA-256: 8c1c09be85bcd6a4a6437a30ab6cc00fc44d83c895378cec52e308d2a3a6b2fe
font_01_sfnt_off00043f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x43F34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00045746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45746 20648 bytes
SHA-256: 0f1d99f49263ee72a3d156cf71f2d452b8f80068dbd691afd778df783f8a2325

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