Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6c5814fe2118e5…

MALICIOUS

PDF

87.7 KB Created: 2021-07-07 04:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5a8e5506f03926687841b1010df8de5 SHA-1: 66433215896703ade91e95c49172a78ba2d9fc27 SHA-256: da6c5814fe2118e5c7c655b3af20c70a6640ac96317db4b395be425d0e9f0329
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious content, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://alpha-th.com/userfiles/file/637887204.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/ee64cbcc95e1a97503704fd3d5ef68c3/58309401037.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/p5r41otp65frnvsv3n53t17nj0/26305677228.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c070e200bd---94217129832.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/90056306394.pdf
    • http://zaun-produzent.de/userfiles/file/40949335924.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/85587458120.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/tajemozedixekedepebus.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608154e15d317---xojalabubexuwa.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf50b25fa0---varubipet.pdf
    • http://goldnumber.info/userfiles/file/domenulutu.pdf
    • http://madmojo.com/fckupload/file/jibiloruga.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/joxawis.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/jba05r64tcd847l6a8t7narsb9/xasaki.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/c18a53b0f9f5fb91fcc40f1da563764f/52142347441.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a8d6df1e4---mapexo.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab14317b949---92924568961.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607186397479b---vuputufavogegutuwu.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac7ecc4196---9627659514.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/1fed1a13505d4d236c33517b1583da39/96405449616.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8ea8de434---95330313212.pdf
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/ziporovekadelo.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/b2acefe4b7484349851dde4e79215c3f/9351117844.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2a1f2d8f6---32496260770.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d18d8dd8f---40305201462.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=crack+office+2013+product+key
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f049.bin
58fde22fbeb37bf788e24c2516528bebfdd4621e18c67798b6d54db1959f19c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 17312 bytes
font_01_sfnt_off00011d8a.bin
fe6d3fc6576682ae66cc2a50e843a833470c3c521f3a3592b10222a518c7e0ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8A 11100 bytes
font_02_sfnt_off000137bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137BD 16792 bytes

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