Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f14017f43e634b…

MALICIOUS

PDF

68.3 KB Created: 2021-09-24 17:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b7ec7552e45809e30bdbd4c3a740fbc2 SHA-1: 93370fca2571de626f77e8be884184aea5d98fcc SHA-256: c9f14017f43e634be6ca9580d62effd20d47d5a3f2193c85b1429323ed138988
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and the presence of numerous external links, many hosted on compromised or disposable domains. The heuristic 'PDF_IMAGE_LURE' specifically indicates a screenshot-like interface designed to trick users into clicking a malicious URL. While no scripts were extracted, the structure and numerous URLs suggest the primary function is to redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://catamma.ru/uplcv?utm_term=send+delayed+text+message+android PDF link annotation
    • http://grimastone.ru/files/kiril.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/tetinagexo.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/dixozupiliwurejifonasagab.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/72017003611.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/fidoganewovizazu.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/22208741300.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/98c267a8e79c3e139900ed191c2894e7/sidasiludinudagan.pdfIn PDF document text
    • https://kettosallampolgarsag.net/imagini_ws/xaxavudi.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebd82ee618---63093290759.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/lifazoz.pdfIn PDF document text
    • https://felicityokolo.com/file/1123749081.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/panevox.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/5144811888.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/2896176772.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1630780615.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/9lfbv6db4vpgdkk4hc3lu6hhbk/9769887243.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/83025047574.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/71925398929.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/rugolezagedidudiwopivo.pdfIn PDF document text
    • https://ms02bet.com/contents/files/sedilixe.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306fe0619d7---damakegoxegetawul.pdfIn PDF document text
    • https://www.vconsole.com/ckfinder/files/vudirezapixuvubudezukes.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/9642043545.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_off0000b05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC871 10880 bytes
SHA-256: d7c9707d8348472d0ad65e793a41e44ed980dc5da10ea3e0bb6bf9c3225e7ee0
font_02_sfnt_off0000e16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16A 13620 bytes
SHA-256: 4745620652d01d8788a074ede866a8fc1ee1596114601732f39972c3920afb05

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