Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bafcd8bef161ea6…

MALICIOUS

PDF

83.5 KB Created: 2021-09-02 15:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6e168181c7e21cf1c9dbf691dd0bcbd3 SHA-1: b69bf69925a94f400eafa968a106ceaa41a99cb1 SHA-256: 4bafcd8bef161ea63669c3b05dc23d60928dcd7531f325fa6d45c74e3d9d6071
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, likely serving as a distribution point for further malicious content. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc66f1c10b---zevixozagiz.pdf In PDF document text
    • https://wasael.com/userfiles/file/31480519804.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/94810012023.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/161115bcea70fb---waviziwagefejafa.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/39a3634f69eb3a03f50024a35ff73439/pivoji.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/481274c966b3de3ab96934ed15a4e78b/42254787248.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/754eb6072b547c9ed7f59ebab7fe9f0d/87601881538.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/52301497977.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/zibejivebijoji.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/760c08a0ff5b039246d9790a045c8f16/15198575416.pdfIn PDF document text
    • http://gdaniec.com/upload/files/3451527383.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727b0cd7fdb---2954926812.pdfIn PDF document text
    • http://test-immo.com/file/28348455839.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/pan79va5fkgi7lies0eneg7ieo/9239338431.pdfIn PDF document text
    • http://exosushi.com/uploads/files/74112457952.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6997fc9630---4660552892.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/gevilovurori.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/87178713668.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/aq7d8aatb5lcaslhs30qjl2bjn/kirumipamitujetu.pdfIn PDF document text
    • https://info-jimukyoku.jp/lot/upload/files/71732495907.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/df88028feed74a275451549770398ed2/89680305353.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/bipagonilixaxikeliteperol.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/90479289189.pdfIn PDF document text
    • http://internationalbeautypageants.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/pibekipigetolunonexawutut.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075f5675f427---87014150818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=learn+autocad+2016+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_off0000e1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B7 10828 bytes
SHA-256: 26baed6538126dabd4c4b1e8aeb4717096ce94679244c6b3049d855510789c39
font_01_sfnt_off0000fae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F3 17588 bytes
SHA-256: e6fbd484109a612a9960100ddbe1772c68605c57165098bbfae6f6ed24ddaa14