Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ffed87b5c2b190…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 04:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: acc566043d08ae70f8e71fb630ca0653 SHA-1: fb6fe1ae129fc6687760f43cf5fecacd57999da7 SHA-256: b3ffed87b5c2b190cfe18a367a7bfe8b3d8b4dff8dbe1bb38b390bec8ff5287e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of 'utm_term' parameters suggests an attempt to track user engagement, common in phishing or scam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=boboiboy+galactic+heroes+game+download PDF link annotation
    • http://mh-gartengestaltung.de/userfiles/file/kevetugavowi.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fusikupufegososegixadan.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/fipimisofuzepavum.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/7550581431.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161414198e581f---gerezaw.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/dilonolerexupefukemepefa.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/detavonevokif.pdfIn PDF document text
    • https://irantruck.ir/data/file/29766235340.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/vusatabiv.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/82500592092.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/d6a8632e2df32681e468a37cf3d8cff6/72966798635.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/48129966337.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/80086276436.pdfIn PDF document text
    • http://toroisg.com/public/images/files/mifigepilav.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/jesupemerogajigimamizef.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134877951e3a---65716428815.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/96684192731.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/96783900944.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109090407379989.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/zodulokajukikaropaxuzasod.pdfIn PDF document text
    • https://andana.us/files/files/19056722845.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/2b8f96b623b518eeda7d5d72ea5ff527/devuwipunuxikavoxe.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/tesivunutesi.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/10353173059.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/99255189265.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_off0000d761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD761 11212 bytes
SHA-256: d3c6fb8a30eb44e8c034c4118ed15c0c0bf707b6cd54661b80d970eb27d2112b
font_01_sfnt_off0000f15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15E 16960 bytes
SHA-256: 8f67af6712c2bea47175540b5e318708df5b5b1c8af0102c06b9d7fc07a34b22
font_02_sfnt_off00011ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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