Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb835f13a0075cca…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 03:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2fe77f691d888dceb789ac4f7c9d057b SHA-1: f8e4f639039af1a7d3ea607d910cfbbea2eeede1 SHA-256: cb835f13a0075ccab22b21872e01291abc38237bd79d48146f8c37ef9467af93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various potentially compromised websites. The presence of multiple URLs hosted on disposable or compromised domains supports the phishing and malicious content delivery intent.

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 https://cailux.lu/userfiles/files/lamibabep.pdf In PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/6822531849.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/56776894069.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109111025134004.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/pejitoki.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614073667acea---68260857750.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5180465d4---pobugobixipo.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/53663456890.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/56474828206.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/75316494996.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/jokifunepexibipak.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109131910273453.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/jufagakato.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136a64963e1c---nowezagim.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/tixidutivudipovutoziwatil.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1a83c65f94d1af6432e2ebeed98e48b5/65731704858.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131551780778---19581866365.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/86818211118.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/xoxupowofopavek.pdfIn PDF document text
    • https://tekartltd.com/upload/files/34312882523.pdfIn PDF document text
    • http://askort.pl/Upload/file/kotunupukapoxuv.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16140d58fc80a4---23123317811.pdfIn PDF document text
    • http://4bx.pl/public/file/14072743850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+do+i+turn+on+auto+rotate+on+my+phonePDF 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_off0000d528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD528 10732 bytes
SHA-256: cdccce259dab18b51b5fca4184233494d1a21626c56c5b3593f195b244d46c32
font_01_sfnt_off0000ed9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B1 18164 bytes
SHA-256: 2ca52e5d93983a0b08f0d3d893c2ba808a673843abb9385812335f89e51255bd

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