Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b0f210678a26164…

MALICIOUS

PDF

86.7 KB Created: 2021-09-21 03:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7ddc9bf4eecaab661ffa3dc0de8575f4 SHA-1: efd35398559e0994207d067c647e97ce89099b19 SHA-256: 6b0f210678a26164d4da54ab88e86bb63b79c3be73f19204a81b77d6fdc52e10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external websites, many hosted on potentially compromised or disposable domains. The presence of external URIs and link farm characteristics suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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
  • 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://pistant.ru/uplcv?utm_term=cara+nonton+tv+hbo+di+android PDF link annotation
    • http://thietbianninh188.com/uploads/files/sabitidefubozuwafuropas.pdfIn PDF document text
    • https://upaspor.com/resimler/files/60498291989.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/oincsh47pvgr7n0vdq61hjna3e/18655798612.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109010720215366.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/16431398244.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/36795811585.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/vizobunox.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/83959760459.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/3104498385.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/sifib.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/60927175700.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d9073a76c---zojawiruraf.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/tiwifewogubetexinamib.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135ab8f243de---66006410375.pdfIn PDF document text
    • https://5uempat.com/contents/files/rakemoxunugutitafifetufem.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/nh6ji4rsjcv7emakjqma2pjqcu/kerisujezutewedanipekesuz.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/seretoroxejavew.pdfIn PDF document text
    • http://mousike.it/img_ins/files/tavorupirepefedifadakep.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/titemoxurulawipu.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/fevofusatipemivod.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/kuzudinam.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/sizofumesexega.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/d075ed924cb2e34517360b701e1d831f/gagemadiwibajiraludef.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/64869530794.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/92129046758.pdfIn PDF document text
    • 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_off0000ee05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE05 10236 bytes
SHA-256: 8114cdfd6d0c0be5aba5167a48c5370f433135d1ff01af3dc32996c76cb64669
font_01_sfnt_off000104ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFE 18208 bytes
SHA-256: fbffc326d457898fa6b95f0a8266972c68ce005b22e5a37ffa026d0d55f55fd6

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