Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa09a9dcd6ddaa1c…

MALICIOUS

PDF

72.2 KB Created: 2021-09-13 18:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 251cec376d2f034668839fd202d41dfa SHA-1: 0a4e01d43227fc472c5b2e0b271e468297942b92 SHA-256: aa09a9dcd6ddaa1c991085e7acad1f2427bd3c715c66ee9a6a6e90e7312be3a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, likely to redirect users to malicious content. The PDF structure and embedded URLs suggest an attempt to exploit users through deceptive links, potentially leading to credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://krisoc.ru/uplcv?utm_term=american+sniper+free+pdf PDF link annotation
    • https://honghow.com/ckfinder/userfiles/files/92035697666.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/55281342799.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/rcpirquu43jfldqugehjtlfch0/8627340018.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5a1a68b67---wexanufisineto.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/97229949398.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/56449941339.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/c9c86c0c556fa64f4c6f5a973debc55c/sofejaxaluvirutirali.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210904160008030.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/lufap.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/25545508559.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/d60c3itap9e0fong81klm8f23g/vinumegoremas.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210905151849.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/98702866121.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/tutekixamol.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/96251773908.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/0829c996a7c9d61fe05c7e41718f1259/sakexu.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/13546494168.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/galavafanupunadun.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/rimupebodusilufizu.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/18176458584.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/17943071707.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/kql4nr7trbdpqmhr14k8icllp6/bibinazasojigaku.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/21767348280.pdfIn PDF document text
    • http://cosyromania.com/media/file/68808209466.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_off0000b766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF78 17024 bytes
SHA-256: 65ab805fc4f8c177171189f542d5f3a50b1e15300a724db24914bdbdb93d8f20
font_02_sfnt_off0000fba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA0 10500 bytes
SHA-256: 4645e44004baf48c6365570b7fb587cb3835512b2b14a25e93cbe3eb8fbc10ad

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