Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b209f4ac9fab94…

MALICIOUS

PDF

82.8 KB Created: 2021-09-11 14:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cf50dd7bb8032b342242c68a93bdc590 SHA-1: 2cb8d162bcc215ef353313dc90bff81d92283ccb SHA-256: b7b209f4ac9fab94553ef1edc72acec0576110a0e26d1970a9813243f6943d98
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malware. The presence of a 'download button' lure further supports a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing attack aiming to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cyklo-sport-servis.cz/UserFiles/File/56876437290.pdf In PDF document text
    • http://japhina.com/upload/file/63060632416.pdfIn PDF document text
    • https://aahs.givingplan.net/sites/default/files/editor/file/pumivujogedivaweberukewez.pdfIn PDF document text
    • http://renknh.com/ckupload/files/zujonawutupatef.pdfIn PDF document text
    • https://qkon.ca/images/file/fupetabasesekesugapapilat.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210907_378B542C3D0DC630.pdfIn PDF document text
    • http://besteva.com/upload/files/ketoduzepolab.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/jikidekuxizovetaw.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/85860939996.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/ravajudidasebidozanelerow.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368784e5379---kiwemunujozovube.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/97021349669.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/80501194160.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/nawugulesovizeti.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/dabitowigozuze.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/rutuv.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/seq5o21obdf29ruh4aajgl164n/pepuzagoteratoboxesefotej.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/53813488050.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/52377698521.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/puzokewetetekaxufedexaw.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/30689767277.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/lofedawopesupubuxofov.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/45856093165.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161371888936b2---livodidetisowoxodakifuluz.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/54155078046.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/48742785919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pokemon+raptor+ex+download+for+androidPDF 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_off0000d99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99D 10772 bytes
SHA-256: 0a9dd54bcc453001bc8a18d0dc86d10b0d0458c23b95a6f45a95e84a1955929a
font_01_sfnt_off0000f26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7F 19456 bytes
SHA-256: 8cd3618e68c974630f390ba970dfc614b80d7cfca3383039c14480acf194b17b

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