Malicious PDF — malware analysis report

Static analysis result for SHA-256 41996dfc6cfb0651…

MALICIOUS

PDF

73.9 KB Created: 2021-09-16 23:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d412898ea05b4199a073a183a057c8f7 SHA-1: bec57b71f4b3dff01535d36a0804215236bba05d SHA-256: 41996dfc6cfb06517d821fffebc488f23d5f1453a66c1209ac8ff2bf7b66d72e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage. The presence of multiple unknown URLs, some hosted on potentially disposable domains, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16134d37fdad4e---6063754997.pdf In PDF document text
    • http://clubmaniacr.com/campannas/file/25422644537.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/fejumevix.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/26402597984.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/12539205992.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/jojaxevatew.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/87183940875.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/93493477063.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/75575162676.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336bebe0809---54240364833.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/87137762480.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/pejizoja.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/4243603441.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/kewijatekinoverawojid.pdfIn PDF document text
    • http://fgosvo.ru/files/files/85426469948.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/12689261731.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/81060452927.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/77366453060.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/79792681222.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141cf9f9a4ac---fekevepopikerureb.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/giwetuwilunezokaber.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/478668187.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=view+location+history+androidPDF 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_off0000bfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA4 16264 bytes
SHA-256: f0976910eff1a23ce63e0e6683a4d3f8ce9e15494e873900b6c0cc9e302fd528
font_01_sfnt_off0000e970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE970 10636 bytes
SHA-256: 924df15da4a79f42bb60fbf3c449dbc80b447b62063650fb9b834ac82ed0c91c
font_02_sfnt_off000101d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1