Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a9d6b804153544…

MALICIOUS

PDF

148.3 KB Created: 2021-09-19 05:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5c2086217779d4901216de8402cfb041 SHA-1: 1eb80b53a99d3238b52dffd0d85f34145b5b6f81 SHA-256: f2a9d6b8041535442ddcc2ea201419bdb90f7bdcff3ef74ee18c352a30c5fbd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the overall structure suggest it's designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://ketchas.ru/uplcv?utm_term=streaming+boruto+177 PDF link annotation
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/zinivonadisidalo.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443a2d3e7de---pojaketagok.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/95479269429.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143518345777---62371259952.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/78f8992272f4571773e9a7b05c5a6489/keteluwidojag.pdfIn PDF document text
    • http://doktor-ara.com/userfiles/files/27703823440.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/17260454055.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/dejufopub.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/40217682765.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/m7kg6tcq53msb4d15ftpn3pg3f/25356317567.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/welabuv.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f16b7c430---58322779590.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/65218473254.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/xuvorivitiw.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/8007479516.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/18300374064.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/zezabup.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/nopeniwami.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/92739141637.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/64561740261.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/gunokiduxukifofotobi.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/45151794438.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/13628767468.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/60597275535.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/58513265020.pdfIn PDF document text
    • 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_off0001d254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D254 10656 bytes
SHA-256: d168b498a41f8a2578f0a61b477ac8c06c8c3d6a56748fe48b3b869ccf398f25
font_01_sfnt_off0001ead5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EAD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000202e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x202E7 24252 bytes
SHA-256: 261864e7eba9e6670f53628b15094f0ca19d9fbe2864f6ae3b22a7b033449e70

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