Malicious PDF — malware analysis report

Static analysis result for SHA-256 26da39e0973c4054…

MALICIOUS

PDF

89.6 KB Created: 2021-07-16 02:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0a3cff98edcbcdf61662cb61faeec979 SHA-1: 5c34314161df389c9ca5d290043fedd7ebcca730 SHA-256: 26da39e0973c40547383fda5ddc9aa35ef74a421b6be9c69c862ae58c452d1ee
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous domains, many of which are associated with compromised CMS uploads or appear to be disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the presence of numerous external links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://billedbutikken.dk/articlefiles/file/pilidobovipazorerobilitu.pdf In PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b897adc4cd---71371799992.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/kapolutipunusoxezetegafoj.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88e69789b---76383760242.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/63411488064.pdfIn PDF document text
    • http://dahchen.tw/userfiles/files/woxilomuwubut.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607eea72a2d34---wisili.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/25568060799.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/200834461485.pdfIn PDF document text
    • http://hpc1970reunion.com/clients/3/3e/3eb4c5728feca7eb79feed4eed44c519/File/xetikupewuwuwologade.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081ff03b896d---39132510896.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/17986291175.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-5/20210505050602837475.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/numetanezolov.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b704ffb4029---xokawojafuk.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969e9bcea0c---gemomota.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/70152419449.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/560855304cdeff93f11b9cf1917031f8/73205890509.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/67622224970.pdfIn PDF document text
    • http://starringthestricklers.com/clients/2/2b/2b6f34f03d9ccbd43d04a050b3ab825e/File/wetus.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/ac2fdbebf9c6d7b83b05e902e03c9a8b/81705287898.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/77161018538.pdfIn PDF document text
    • http://bptramptour.pl/files/file/16429709697.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/59dc14314d9fb044fb337ada46f864b8/pomuwikevajakavedobavoton.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070132d13b18.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/bisokiwabamexineda.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af535deec69---95445643042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=meaning+of+talebearer+in+the+biblePDF 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_off0000fd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD17 16908 bytes
SHA-256: c0433c1722806629b65167e5f86f9b74521e6cc541a7f4f44940e1229fe16920
font_01_sfnt_off00012900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12900 10456 bytes
SHA-256: ca26bdd34f3fb6a304d1530752f3773462d9016c02560bab5ecdf522c0e1b35a
font_02_sfnt_off000140a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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