Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cac8c61afd2ede4…

MALICIOUS

PDF

108.4 KB Created: 2021-06-27 17:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: abcce64325d3ae0f0f8b834b91383c8f SHA-1: f817a0cf1cd29793201cae5a5ba0975aebf0ea65 SHA-256: 3cac8c61afd2ede47e3b9be6f4d597d863d44637bbdb5e304979b766f74e6e47
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, likely serving as a lure for phishing or malware delivery. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drentmedischadvies.nl/uploads/files/lebokij.pdf In PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/3f10aea9f8cabfa9d227f09cfe8b4631/potuderem.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/67067290916.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/98579087256.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7868781a97---66358824020.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/05vnqr6cnirvcfohgibuoa34vn/difog.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/32112021903.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac45d7b4f8---niwawixu.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/90102316456.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee1e5b4c1f---lotodoparejaminide.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/g99dkguspv2ivndifisotdflf4/bonajufap.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/vap7majjnfjfm4tokcmr1ja2v2/bosulamikubevojurajiguwu.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607994f6ac044---netekepogamaza.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c26ed81ea0f---86076335293.pdfIn PDF document text
    • https://wagaskar.com/media/vevutivagekoke.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/d4606bd3d6b61604382004a205970885/48011117743.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/69218133315.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/39d82718d23410b0afce927477138c8a/41569517220.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607b666790c53---56958452119.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/4841975348.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/6782605833.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/vimadotodajiko.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/u09l3lvuo2fe7fo47cifriufu5/13623891385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=competencies+meaning+in+kannadaPDF 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_off0001452a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1452A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D3C 17528 bytes
SHA-256: 2efc8b0e80f84da3c1ac51103ff3f48f3b69cecb20eaff976b571e0040441b1f
font_02_sfnt_off00018b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B76 10836 bytes
SHA-256: a6da0041243fb7b20d97f2953c04c6438ec08c4db26f6460ac4deb28a9a058b5

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