Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a3cbe7f3dfc653…

MALICIOUS

PDF

84.3 KB Created: 2021-08-07 19:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 589dc49b727ab3be17b4b64f8f785de6 SHA-1: 84cc56bec71561a9c4d48a32915fb45c63e1cce3 SHA-256: 97a3cbe7f3dfc653da69769605750ce23d3c474e521da9824bbe2cfd991a1c15
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It functions as a link farm, with numerous URLs pointing to PDFs hosted on compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://abril.pe/wp-content/plugins/super-forms/uploads/php/files/v125c3gsbn6eshi8r0612jtnb3/daxigosawirasus.pdf In PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdba6a28047---19401348696.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/56721798608.pdfIn PDF document text
    • http://mega.kz/media/upload/files/39344769421.pdfIn PDF document text
    • http://fundraisingwebsites.com/clients/9/96/963d931f30a9d2280975e71a7f923c96/File/xexudimoduxalap.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/mudameparojewi.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/16d5hgppseqtceplbvg15tebs4/xilagov.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/36475749652.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/40b5aed06387b538c8c2a2dccae8a92e/fapatupeboj.pdfIn PDF document text
    • http://dzbnf.com/upload/file///91452060490.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/02i9bnhle0psol68up8m29335b/bokokaribi.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/40013108096.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160728d61934e5---girorupikixomokafoxavonu.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/33ce84cfa4430ce678f56f498dc33915/66882565384.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/c0ca7fa265e6a69cc19459643060c238/3193669749.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/jijifasewipegunapodij.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/41542377296.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608dac1ac9d3e---famekobiduvolawojutekisit.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/56957466499.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/88180329603.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/d0sqvqlp5codb8gjmfkrpelta9/basobo.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/56234105460.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f161beb277---litizexo.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/44654345682.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db3455dfb9---ririnuxisivugidutolinopid.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/ziropakez.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/e3hl9b93vkfm0snl4iipf9kvnp/93965717762.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/vixizerinipelotirebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=2001+chevy+silverado+radio+install+kitPDF 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_off0000e7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF3 10936 bytes
SHA-256: ec61c148987d99b78c868c62c849312e4ba8b260155ec2a2d640b5bf370698af
font_02_sfnt_off00011958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11958 16316 bytes
SHA-256: fa5661b79a83216d8399eb1794ae0ceffecac7c365a9b0f248bf4179742ff9c1

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