Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5c5644f5a6400a…

MALICIOUS

PDF

90.6 KB Created: 2021-09-06 00:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e6643980256582af8513086e072d94da SHA-1: ae838effb83e7ed98026bfb3972b93c1a18776b3 SHA-256: aa5c5644f5a6400abf771e1a35998635b04d86c9cbe8fc315b04ce5ac3f8ccad
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable or potentially compromised hosting. Heuristics indicate this is a link farm designed to direct users to external sites, consistent with phishing or malware distribution. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://accesoriosalmayor.com/images/userfiles/file/nabebakus.pdf In PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3f5cd82e5---52786481216.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/fetapa.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/65017404586.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/7703533771.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/27690620998.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/felojejugulixosidur.pdfIn PDF document text
    • http://artospace.com/pics/file/vakigokanole.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/wukufenuvitogubekob.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/44426561148.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/94271223837.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/73002623210.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070eaf8e20df---54389726233.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/499019fc525679a6f22524dc13b2d21a/belupesaniwa.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/4aa6e712ad60d17851c2fb775c08d3ec/93085454775.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/e53ebbd5b95c511c2893b027545e4b38/buzatetesulatedabibuzunik.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/28344348942.pdfIn PDF document text
    • http://unsersohn.ch/images/file/70924213681.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e6db184e3abbd61209834b98c3cfa4b8/7828059252.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/12045723889.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210811010942.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/c5gvqhbcl8oijfcij5p7ampi92/lavajepiwimajuzejifavep.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210731_D80C90E5CD0393B5.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/13769757365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=generaciones+de+las+computadoras+caracteristicas+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_off0000fd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6D 18068 bytes
SHA-256: 1bd809664c3248e806900d0f9e7d57ca88b040c468d7bde393c4c6a6f42660d4
font_01_sfnt_off00012aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14305 10920 bytes
SHA-256: 94440facca0de9f134c4c707954bb89b57b623584eb59b8dade8dabbb3f3e427