Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9d7652743feda4…

MALICIOUS

PDF

80.9 KB Created: 2021-09-08 04:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 27a6909d4801e2d39e9bd167b2de53d2 SHA-1: 0058cb5ee29b586b531f83c6be51d84bdb0b4acd SHA-256: aa9d7652743feda4ea74234f37ead50c6d8f48073ce4fa29b26c81409614b90a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a phishing or malware distribution attempt.

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://tucsokszekszard.hu/images/news/file/97015754342.pdf In PDF document text
    • http://dinskayarealty.ru/media/file/87377842811.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/93305955218.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210901_F90EED6D54148E49.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/55277175995.pdfIn PDF document text
    • https://basisnomor.com/contents//files/bivabirabulipexemunuw.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210804063539.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/cs7segr3mi9vpntogah4e7a8d2/simetitedugajaj.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/qs99hoi4k4pap6ed2beasi9a0n/79436007775.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dccd44bb1f---50917041151.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f89a0bfa88---24118707467.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5ea35bf5f---17382184254.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9fce985a688652aacfbb2b3d6203c20c/51793405035.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/vofexizudiveparel.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/tamazuxoliteboligiwikegij.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086ba96c18af---venaxorubelunawavapawug.pdfIn PDF document text
    • https://airshow-bg.com/file/tibijodetoporazeju.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160870c73e9fe4---70898042952.pdfIn PDF document text
    • http://bakoca.hu/files/file/dusaf.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/nurapanijunafefigixix.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/fubutuvunidobilavugipavig.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/7afa61d5571acd0ea22fe47404c0e3ad/21503341923.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92dec429d8---lomutax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=lilac+wine+sheet+music+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_off0000d8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF109 17400 bytes
SHA-256: 93f778a3a83ff67dd44fa653c6d4e67b0826bee42d8d060c9cac720ecd687049
font_02_sfnt_off00011d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D27 10808 bytes
SHA-256: d9263fedd915285753a5018b1df63de1b1892cafa9435ec61697499de0724e5c

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