Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3b10e70f62bca9…

MALICIOUS

PDF

76.8 KB Created: 2021-09-21 02:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 746d42f4ff36ce504d7b9ff0444e27f7 SHA-1: 2ae4d56fae05cadc535cce0cd7376ad8be0e2f51 SHA-256: 3a3b10e70f62bca9f59a7cd752c19496dd2cc33dc51d23eb6adbb389e30827a8
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were extracted, the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://gdaniec.com/upload/files/fodirumepofo.pdf In PDF document text
    • https://soudurelauziere.ca/upload/editor/file/64198230847.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/17638535555.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/kiverumivanesuvugov.pdfIn PDF document text
    • http://waypl.pl/upload/File/fusozividifevujekibema.pdfIn PDF document text
    • https://guijek.com/userfiles/file/joxizovodopi.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/xufelukojosetasosi.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/fitowimu.pdfIn PDF document text
    • http://ubest.ru/images/file/diwutibopakisozexatewivov.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/51074443087.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16149071fc31bd---29188473945.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161326e1cf08d1---45873497702.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/79c7bee699580afcd552c174fe9e5daa/xovisitolepefulubetogitoj.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/97023631341.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/33404132461.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/konemesurovidabexejizum.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/xalitap.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/gidosejonuvupiwo.pdfIn PDF document text
    • http://premo.at/userfiles/file/93276605498.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b1a67d9fb---metevelogazux.pdfIn PDF document text
    • http://nextgenship.net/upload/file/2021092016321745228.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/50845722192.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138800741151---vezosajanaxamuz.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613057c030653---17203324158.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/2780549222.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=convert+video+into+audio+online+freePDF 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_off0000c212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC212 18900 bytes
SHA-256: 286357e0c7f18b90af2bedbe2dd3a53ad1905d673d8afe928094a6c8b179918a
font_01_sfnt_off0000f3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDD 10376 bytes
SHA-256: d1e49d559ca70860890225d0b8796ed146492b32197843960d0327978f6822eb

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