Malicious PDF — malware analysis report

Static analysis result for SHA-256 13cf7bbdb353722a…

MALICIOUS

PDF

79.6 KB Created: 2021-09-17 08:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5aeab0660ddce65bc213a0528fdbea4c SHA-1: 9864216ce353a9243583f54be0c2b6116afcc44f SHA-256: 13cf7bbdb353722afeb9185771ec76496b881a662158d05d9d96b27eb8ea061f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://irlanc.ru/uplcv?utm_term=download+obb+service+is+running+pubg+mobile PDF link annotation
    • http://naturalfurnish.com/userfiles/file/jafimutapuvubofinox.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613522341edc4---gotoz.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16140fe6246d3d---komijol.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef66973074---pikid.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/66027075683.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/8837434109.pdfIn PDF document text
    • https://lapakunited.com/contents/files/tezoxipubufiro.pdfIn PDF document text
    • http://netart.hu/userfiles/file/77471218183.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/sorukidefumogad.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b66054886---wadisonatupobutobejes.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/81395243484.pdfIn PDF document text
    • https://ka-base.no/images_content/file/xuwowu.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/jefudadutimoduxejo.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/josex.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/fopopoxevamarap.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/zigalagube.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/75076862128.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/sumuguwurabodumej.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/petewefibowodolepowokabe.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/damojedogil.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/80535658373.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/galinulobon.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/76540277564.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_off0000c33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4E 22388 bytes
SHA-256: 5780747a2c6d4a4c4601b006e61130bc93376a312b1eae4751cd1e1dd825d851
font_02_sfnt_off00011684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11684 11152 bytes
SHA-256: 82eb65f433031b9fcc7bf38c418fdc4359971c4fb87f112784a07ac4ea8b7f0a

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