Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0fa0b2f3febfc90…

MALICIOUS

PDF

103.5 KB Created: 2021-06-28 04:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bd93055d0896bdc550d5a741437f48c2 SHA-1: 6d2b8a85f5759d11e8bc85cef033899671da608d SHA-256: d0fa0b2f3febfc908b366fdc117f477bcb7c599028ffb1cff33116a354376d25
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple distinct hosts, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded URLs are the primary indicators of compromise, leading to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://aulacvn.com/upload/fck/file/54783710902.pdf In PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/b0954b13890ffafcd993e8221f171b5a/76095442596.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/209c31d7b4145f7f5f6582d4864afa98/givozumigawepudemomefe.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b02a273b98---zevizevugasupemo.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/79c36b2315782c8e53503f629c2d0781/koxemugajosifiwolerir.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/bcnndt5sce9befprf9r45uv0j6/vabixuperozenorefiluwoji.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608953ae4c977---3913429771.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/makuguzaw.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/7tuc7b6r55s5uqv4e1ino3cff8/62989723215.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/291f44bc717ef141df4fa5a767b37e5a.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/2496e239743fd31696713616ea28f56e/loxivigad.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/b25cd486204c3c65805818db49e3983b/lujuzelaxirikigunir.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/mazisexes.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/sazebupilizupubim.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/12776673809.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/wixetusawubevu.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00c7368423---53882876438.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076dd237fc69---6049632300.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c102a741fd---jugunewunuj.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/p6foid2eaiep95iuqh6g2qa9ln/28539075324.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78510600561.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/cd7f869f5e18ded62ad74249450f60ca/97531633959.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087fa6e41edf---73315328043.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/40d6de877a7b949c0c64d60929d1d7fb/63222071705.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb66da9ca4---60109527373.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=no+mercy+baby+come+backPDF 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_off000136cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CC 16660 bytes
SHA-256: 3e1f020f49218eab5c5833d467f3aeeebfa58e1a57476d8d6ec6aab78c7241a0
font_01_sfnt_off00016201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16201 10208 bytes
SHA-256: 6befd4ca707c7c4c9d54e0b10edda66fa935f8819a3516b51bb16398141ac2cf
font_02_sfnt_off000178f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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