Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a07c6824c14b96…

MALICIOUS

PDF

71.5 KB Created: 2021-09-30 10:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9b0fba69180d6cfe27028277c15779a5 SHA-1: cb0ac2df46c4211bbcd6cab679fbf77bfa69f226 SHA-256: f8a07c6824c14b96b4e5faf54250c79c3b882a21dc47de79dc23b88023516c0d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URIs, including one pointing to a raw IP address and others hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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://catamma.ru/uplcv?utm_term=pagalmovies+war+2019 PDF link annotation
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161484133a7d9e---tufew.pdfIn PDF document text
    • http://dhalahoredeals.com/survey/userfiles/files/lufugo.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/fodufujaxipirutizidofar.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/81391337872.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-3/20210903205626997996.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147fdf0d7157---zaxazigufetetunolima.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/pupinefikurexenifuvifokap.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/1480f82f009ed525172b52e939755bce/99474245996.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/79013823501.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/49189631616.pdfPDF link annotation
    • https://nasco-ye.com/uploads/file/sifiti.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/25914203048.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/75281189117.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141756d436c0---23611284494.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/falat.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/tenebujorajopid.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/lupafovuwovivisagefuwixob.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/47997961992.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/diwuxonipevaxutotixi.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/80757959833.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/22273122055.pdfIn PDF document text
    • http://chapelguild.com/images/usr/56863574374.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/labowujuxinazimiwugadunu.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/27162499057.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/jidetowepudad.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_off0000b551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB551 16420 bytes
SHA-256: 7f713f9b6197ccf01b735954a9c53c405e9031381c0ab11aff470ac9462682ea
font_01_sfnt_off0000deac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAC 10864 bytes
SHA-256: 857959f3903aca37eba623590171231101102231f04857b1737d32586c8b713a
font_02_sfnt_off0000f7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1