Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74b3a73f1e3e88f…

MALICIOUS

PDF

83.1 KB Created: 2021-09-24 00:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 800d54abdbb30d12bff0d603c70f98d1 SHA-1: 0b34e741838a1cf0f8c42a1b44fb5b6ed4b7102d SHA-256: a74b3a73f1e3e88fe0f369591adbbac9fa7ac5263556faaace5127cd7b49d6a5
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

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://marblobath.com/app/webroot/img/files/lipunelotumuxuzeziloti.pdf
    • http://vektor-bezpeki.com/userfiles/files/64717730896.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/u20ptq9t8quojtr1mbrg2hhoc2/likipebipagisara.pdf
    • http://bebsulmare.com/userfiles/files/wufovitinakefuzatowu.pdf
    • https://studybrilliant.online/app/webroot/img/userfiles/file/goxikolugo.pdf
    • https://nepalmicrofinancesummit.org/userfiles/files/6759880326.pdf
    • http://distant-property.ru/fck_editor_files/files/sejuzovuzovidiludaxa.pdf
    • https://www.leasing.net.in/ckfinder/userfiles/files/tolewenudapego.pdf
    • http://www.motionmantra.com/userfiles/files/gijuvarulu.pdf
    • https://adikmanis.com/contents/files/sagipa.pdf
    • http://profstil.az/userfiles/file/jigopasojikijuxugus.pdf
    • https://kodcomputers.ro/2664/uploads/kopapejoje.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2b953e070642e998c9d612bed18b29eb/rubovigebudeba.pdf
    • http://gldbirdgel.com/user_img/files/39446542395.pdf
    • http://leylasuren.com/images/userfiles/imagefile/35044917681.pdf
    • http://www.urbanwaterways.info/files/14889239501.pdf
    • http://aquaclub.hu/userfiles/file/pazemutuj.pdf
    • http://faizleathergloves.com/userfiles/files/66778339683.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/1db20830cf0f2afe3d6d7aaf69ebffcc/tapirozajomiwisoxok.pdf
    • https://heyratacademy.ir/file/92275125019.pdf
    • http://amsaneeraus.fi/userfiles/files/2390998053.pdf
    • http://cathugo-yachts.de/res/wysiwyg/file/bopewivaretorojijabinop.pdf
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/zimofi.pdf
    • https://apskarota.org/userfiles/file/54704385681.pdf
    • http://adgroup.co/userfiles/file/91061937008.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+turn+off+ads+on+my+phone
    • 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_off0000de86.bin
32c5d7825b807c274a71e73bd3cc98ccf6303026dc98156b477b54b4f84c4082
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE86 18004 bytes
font_01_sfnt_off00010d3d.bin
a0445c27d33639fde990424f1e9aedeb49794f13c713b172272f7cd17f4695aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3D 10916 bytes
font_02_sfnt_off00012664.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12664 16792 bytes