Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c817d147cfc6a9…

MALICIOUS

PDF

87.7 KB Created: 2021-09-23 07:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 21cd4a8e1709f9c41fa73017dc4c2cc3 SHA-1: 21aa66a1a0801f6d23c1171d30b997a55b7db939 SHA-256: f1c817d147cfc6a9894994b654dc3878bc8b26c41261322c75ff2d4bcdd9c3cf
176 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, likely serving as a link farm to distribute malicious content or conduct phishing. The document body is unreadable, but the heuristics indicate a deceptive structure designed to redirect users to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eea781c6f8---xujaxipibuzokusigamomanex.pdf In PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161416f39cc299---jazevulelaxobowuwumef.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/kekilefaravodavarafirubon.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/78727790802.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/93af42f2162f76c6fc410026319b8353/20074621597.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/54338612505.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/78820774581.pdfIn PDF document text
    • http://lblussana.it/images/file/fekinuxugekopafuv.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142669f926d6---20431730740.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/53155490626.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/44387453297.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e7af07af4---jubagudivulowak.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/pefawokitaxifewe.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/burefajotorukuzedesoxidi.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/fapb11d4bifjje487tdgorvmo6/zewija.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/45869429244.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/4982514822.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/jejavimeg.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/86144000904.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161401bf904675---pufopipopelebi.pdfPDF link annotation
    • http://workontext.ru/media/file/84986245062.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/juromaxotejozodulifiwaw.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/82765752777.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=pubg+lite+gyroscope+not+workingPDF 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_off0000e784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE784 21032 bytes
SHA-256: c71db3679fc1a7500fea7c28fb42e9436054207b15fce019a30c49c3b5f6e8e9
font_01_sfnt_off00011fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDA 10920 bytes
SHA-256: fe40f17487bcec862a7e981f3bfc4e1ca8b715b08c6776d7930e62d3a2b54952
font_02_sfnt_off00013923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13923 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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