Malicious PDF — malware analysis report

Static analysis result for SHA-256 4031f15b7ff84b1a…

MALICIOUS

PDF

83.2 KB Created: 2021-09-06 00:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d26924f542f6d9b6e3cf875b11a4c668 SHA-1: d7cc4341f000cdc6d9e42d0f0d68ffeffd880352 SHA-256: 4031f15b7ff84b1ac4a20ffff051b6fd699f41e292ce169f2fd29f653c211d6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable domains, designed to redirect users to malicious sites. The PDF's structure and embedded links strongly suggest a phishing attempt to trick users into visiting these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fw-simple.com/uploads/files/zajazavisuzoxugad.pdf In PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/04dd593bf29b24340f9a06437a6f8ce8/bevutasujepa.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/27432410146.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/7r9fedrblsq7jgmolgqbn8be30/jofuwefonazigizada.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/91374634580.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/71601182292.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/8o0dtj5phu3vkhl81e39so29u4/mapobug.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/86207000872.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160726c70e6f3a---59803073815.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b193063356---50546663786.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/3d05245851c602b77d8a3d5c67782d5f/davekajukexab.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/32267905298.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/rujuduledemobob.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16090f714e0afb---sitepepifu.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e0588e9df---63784275540.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021062900385429.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2a691dc3b---34741879323.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/b240bb56890d5d882045efabdf80337c/14120464888.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/xinupekupig.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021061601442680554.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/ir4tbl1ru4k5mch9svqu46aim4/27005463175.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/fofefeluzepunupedagigi.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/62741511112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=sudoracion+nocturna+en+ni%C3%B1os+pdfPDF 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_off0000da85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29C 10948 bytes
SHA-256: a2b974dca1ef65aae5137ed5714322ef5a29bd477f5817c7ca0c33e6846df575
font_02_sfnt_off00010bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD4 19320 bytes
SHA-256: 4f9e54fbfbd32cf651ecdce6ec38b7e0fd5c8a16a42be2f3e526955e86f210c8

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