Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbad5a3732a3e92b…

MALICIOUS

PDF

93.8 KB Created: 2021-09-11 16:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2e25de3dce122c5a5027ad0f190052f5 SHA-1: a9f5864f60a4a9c57226e787f5095237e19032cf SHA-256: fbad5a3732a3e92b19a09894d7c09b9d98b9b8de2089f2f471affa28320f4d83
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the embedded URIs and the heuristic firings point towards a malicious link farm designed to lure users to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://inwebjor.ru/uplcv?utm_term=life+1999+123movies PDF link annotation
    • http://shopgraeagle.com/ckeditor/uploads/files/44097732981.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/caac214604623faebaa4dee8831fc6b9/43983966316.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/62053966781.pdfIn PDF document text
    • http://hidropro.hu/upload/47983072072.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/16989665530.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3ab383025---dabidi.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/medabenapuligutigapuk.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/1788446329.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/35568859991.pdfPDF link annotation
    • http://mclarenquartz.in/ci/userfiles/files/dumerisad.pdfIn PDF document text
    • https://tuinvandecruys.be/file/92153360994.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/xebabegonobakovajozobaled.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/muwuwoboduvi.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/27032418216.pdfIn PDF document text
    • http://esejsc.com/upload/files/xiwuseti.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/48276412054.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/dikufatajejajoni.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/zabalakefoduj.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/9119069001.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/gatofigosatopalisud.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/33510645205.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7cd10035d---73866193895.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/e2c222ca32ddc94ba870927b08d5c1a9/tadudivapokov.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/22100130938.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/xugol.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/82290609448.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_off00010555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10555 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6C 10400 bytes
SHA-256: cd2b8dfa3f1e621930d55e672cc011468ef11c77abe5dbc98e1eefbe20112f40
font_02_sfnt_off00013529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13529 19972 bytes
SHA-256: 416f616b0b006bb4b0bc7cdb57b915cbdc7dfbef2d7da87dabbb6216d023fd73