Malicious PDF — malware analysis report

Static analysis result for SHA-256 23302e64a4e836d9…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 11:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c7b1320a06c8344d3b91de596e418f54 SHA-1: f2fefbab41078fe2c9e7d336273dbb20dbdf9633 SHA-256: 23302e64a4e836d96ddb1d690e03fdf5095e38c4e420a657d11375a15a3cea93
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, several of which point to compromised CMS uploads or disposable hosting, indicating a pattern of redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=look+up+gtin PDF link annotation
    • https://veterinarycarefoundation.org/userfiles/file/71928655373.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/39907094320.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/xozotoni.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/wavuwujigiwidovebabi.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/pofod.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/wumajozakeko.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/9901517504.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/b0de4f4e4e7b67e8fc0aaf4d995c0703/67762381681.pdfIn PDF document text
    • https://coluer.ir/documents/file/zodivokoruw.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0f4b396f4---natixogas.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136062418cf0---52127718060.pdfIn PDF document text
    • https://equalland.com/uploads/File/jokegomovujas.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/divugixuwanudazejom.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0c4d5eadc---67378326842.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/75996576947.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/37610236087.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/gugudakaxuwo.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/mijopajufu.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/1c9ev7r1vh79lfb2ga1g5sqqe7/pepigune.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/14671754527.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/newapu.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_off0000dc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A1 18592 bytes
SHA-256: 05d17c1de68a3b727dc242d3baae3ede172d987dc7d8565ededef7c71876649f
font_02_sfnt_off00012536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12536 9968 bytes
SHA-256: 683bca34877d3e59dda6988379774f26fca25ef61ba38281466fb65fdc3d752d

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