Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e2436e578867fe5…

MALICIOUS

PDF

80.2 KB Created: 2021-09-12 11:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a6e29e83bfa9f3fa77b0a3ef8b2c5b90 SHA-1: 51d6eae80c912af526e33dc46a06b13fd354aa44 SHA-256: 2e2436e578867fe55dac63144cfd1358ee1ea2f69ccd6ba85388251f5c76c3c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs and link farm patterns, suggesting an attempt to redirect users to malicious sites for downloading further payloads. The presence of compromised CMS upload links and disposable hosting further supports a malicious intent to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://drafthe.ru/uplcv?utm_term=download+free+android+file+transfer+application PDF link annotation
    • https://detectagsafety.com/ckfinder/userfiles/files/42475073603.pdfIn PDF document text
    • http://irollee.com/userfiles/file/fisapafugin.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c705b9a7b7---jinipavabed.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/degibotozivonowopone.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/49242141981.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fab33c89a9---75213468971.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9cc049a85---fisaxe.pdfIn PDF document text
    • http://glassick.com/userfiles/file/woxavobajerasa.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/34363327176.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138e4e2ad419---13718266236.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/46511784618.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/jurewuviwupejuli.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/rovisutes.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/82012172486.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/tadozukumosufubud.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/levoxifotuzujukofugob.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/35757282425.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/bupeta.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/67486439356.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/74393635020.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/xibepoximufoduveva.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/23511483401.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/38274907458.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/9045587705.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/18392640913.pdfIn PDF document text
    • http://skisun.it/userfiles/files/15015608556.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_off0000d64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64E 10700 bytes
SHA-256: ef1065910baf07c371175f05d71dde4616121fee8419e6d45bf8ac11c1a7e829
font_01_sfnt_off0000ef02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF02 16928 bytes
SHA-256: c02f7da0918f9103d72a1ade75e1388a2c358403bea89adef07c7174a8d09b49
font_02_sfnt_off00011ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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