Malicious PDF — malware analysis report

Static analysis result for SHA-256 773fa584fc986778…

MALICIOUS

PDF

84.0 KB Created: 2021-08-20 04:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 0a22870227afc85519a0475bc7cea733 SHA-1: 34d4eb863438665191164baf808de5dbbde98572 SHA-256: 773fa584fc98677852164f6cbbb0ddf746d4a35836a95dc1fca34b0ecc16ec22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites. The document body is heavily obfuscated and appears to be a byproduct of the wkhtmltopdf tool, offering no direct user-facing content but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba65e279a6c---xuduxupejoda.pdf In PDF document text
    • http://partnercable.hu/files/60450557306.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608260fe449e5---15874313453.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16088251f6da56---47634261870.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/561bdd050faf0a29f9400a12d5210d40/83277535861.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/lkmcpsnab7uotuq029nru34krf/gamoti.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/rukotigituwus.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161116e6aab432---nizivubawuledazu.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/55416295812.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/7gf33ff2ev83bbglgojih2kne0/12683256080.pdfIn PDF document text
    • https://kueapem.com/contents//files/zonugifanejusuvalejinawu.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/d34a70db13339b4ac637f43d027ede52/pavisuwukebuzamigovag.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46b54bf2ad---wixanalo.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/minetipamojaluvizoda.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf41ee80ef---laletoji.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bc3dc0517---xoludejepakadeka.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/68657163303.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d56f9f3fe6c---67142270804.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/xukufiselabomilo.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/18384532837.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/duwozux.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c89e6a82e7e---91715261976.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611438b58938d---51211529071.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/nizoxikamopuziwibajib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=adjetivos+y+adverbios+comparativos+y+superlativos+en+ingl%C3%A9s+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_off0000e22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22C 11648 bytes
SHA-256: e4db7232d5ad51ac7fdd4cc35ae359601882dcc84edb6596a7fc25b938615286
font_01_sfnt_off0000fd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD31 16780 bytes
SHA-256: 413c67f12b7b249629a319c547d33058bfada9ce3302106f263a22504a1f29a9
font_02_sfnt_off00012798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12798 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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