Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf3da898982f1e3…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 23:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e5def0918cf40f49f6e5b4e4060806a9 SHA-1: f4beec74e17cafcace8b34f0ab17a64a885c9ef0 SHA-256: faf3da898982f1e3324245348a131a25ab19e42c7f1ecc82b973f9d2277c529c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure as a link farm, coupled with the use of compromised hosting, points towards an attempt to lure users to malicious sites.

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 https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b054050d9f1---pafamoxavovaxego.pdf In PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/19352348305.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/19166474803.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7f85bbcf7---sedozamefedabobil.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/24383318138.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/13236065007.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/40706dbb6c7fc1e2efb9f4930028af6e/zilesimibunozoforulotame.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2f66bfd27---13284234991.pdfIn PDF document text
    • http://bio86.fr/fichiers/50083048663.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/nabelukupijivosumelu.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/gujufofuwemuvigab.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c17d325e53---73390574888.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021070407431973499.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021082201283173499.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/komepobufu.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/60021502290.pdfIn PDF document text
    • http://odumakus.com/uploads/files/69167124569.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/ef4484505c9acc63dbceafd3083c57f1/savukalakerurudi.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/nemenojakotelud.pdfIn PDF document text
    • https://bonekarusa.com/contents//files/fupevalederumojexuv.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbe294d32c---vikitesezedek.pdfIn PDF document text
    • http://srutimusic.org/userfiles/file/75498749619.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ed68667f1---11294131487.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/54231780130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=signs+and+symptoms+of+angina+pectoris+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_off0000dc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC56 16920 bytes
SHA-256: eaeed63816cb3afca17c619f148fed05fc18bc125ff734826f489aaa7d1047ed
font_01_sfnt_off0001073c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073C 11108 bytes
SHA-256: a50234436be6aedb5df91e84cef27c1e4c7536527d0cceedd01d1f7298f441d7
font_02_sfnt_off000120f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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