Malicious PDF — malware analysis report

Static analysis result for SHA-256 1efa3e3b461d9e5c…

MALICIOUS

PDF

78.7 KB Created: 2021-09-12 18:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c2601f93917b392afb586ab8f0361ada SHA-1: 4165f4ee0b7bf032a125e2bb5553a3e04b98e36e SHA-256: 1efa3e3b461d9e5cb51ad4b8ce72a678d2a4fb99d148546b6e1b96ae0593c5b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using small PDFs as link farms on disposable hosting, further supporting the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=alone+by+maya+angelou+meaning PDF link annotation
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/diwiruwobabita.pdfIn PDF document text
    • http://findusafranchise.com/files/files/16150741884.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/matedamel.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/pororutebifisigisim.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/kegurulaz.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/todidebe.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c089cbfc68---xorowupunajebomojunejina.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/divofapote.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/6103224170.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d8a21e78f---wilakitubirax.pdfIn PDF document text
    • http://cochemical.com/upload/files/walolemevav.pdfIn PDF document text
    • http://agilesolutions.in/uploads/xapukimetaxuli.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109080115539124.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/97173233950.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/45228948463.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbf53f3b71---13525269640.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/12183820351.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/dedunifajifipezejes.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/zetove.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86854726d---11683858186.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/70437094774.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/dalibemikuri.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e568d4332---tomete.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3185e32a95d1b176af3b46fb8537d55d/derorejarutinegusevuwu.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_off0000d3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 10420 bytes
SHA-256: 03e7cd86007cdaa7902628459b86eb504bc94ac8c17c9a0b105775640fb1a7fd
font_02_sfnt_off00010398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10398 16308 bytes
SHA-256: 1fe34353fae15188ce2e08e8bad73f60b2511f63d3f4606ead22f01234aeed5c

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