Malicious PDF — malware analysis report

Static analysis result for SHA-256 71842096466d9d40…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 10:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 070aa7784464531beabcd650fee3461e SHA-1: 0ca0e7a29e9f12e7d6ed8c6784bbdcab478a708a SHA-256: 71842096466d9d4089a38b86fb55b13b0eefdc835b2ec421d78632468f40c1d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to unknown or potentially compromised websites, suggesting an attempt to lure users to malicious content. The document body was unreadable, but the heuristics indicate a link farm structure, likely intended to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/43fef3fcd72e626cb8ad7a89a3aebfa1/gulubibaxevexapotoxeba.pdf In PDF document text
    • http://steakpluspizza.us/userfiles/file/55059003749.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/42438172921.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/71836587613.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc1dcd0e49---89178968501.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/mapifixilol.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/18560745222.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/xebofiga.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/97532325034.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/tuwenivotag.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/67214273058.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/71371625701.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/samitugiri.pdfIn PDF document text
    • http://glassick.com/userfiles/file/5043714741.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/sutisazevarufatez.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/83314083298.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/632ec6ea0c9b7766ae8d9f7fb61fd586/judamukalapepux.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/43339239351.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/legumadevowanudinotox.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/21325058930.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/nugutixovepenori.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/92465946044.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/ziduzebozerodu.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/runadebibujatofikix.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161445961f2b75---60501917150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=can+we+remove+snapchat+filter+from+photoPDF 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_off0000db35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB35 17784 bytes
SHA-256: d151d6bb63bac027b9ff73ca27c891491aef6f4bebd1b806a92aedd79c83ee84
font_01_sfnt_off000108e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FE 10928 bytes
SHA-256: 93fa3fc22b540b679d2f76a64a5159580c1c1c28417f0b6cf5a71ab7f29fc4ef

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