Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e09c738bf214c37…

MALICIOUS

PDF

73.2 KB Created: 2021-09-17 13:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5ef46a7ebbf3af8e0b2a1f5dd4a36e5e SHA-1: b13735cdbe4d327990db8329b4d335c5319a1634 SHA-256: 8e09c738bf214c37c9d110d30c5619c6295ab9b4964d63328f8bcd228bd032cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised or disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of PDF_ACROFORM_BUTTON and PDF_URI heuristics suggests interactive elements designed to redirect users to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://zamel2.pl/userfiles/file/50487315020.pdf In PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/176987356.pdfIn PDF document text
    • http://alptw.com/images/files/43520200939.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143e86a3405f---lesigubavulasab.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/92354300467.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/vulapijiwegobuwuwoxavux.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/bojogipitizuwon.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/12342667123.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/gozexokobirajigozesujowu.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/90239875418.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091104193473499.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d322839564---kizigu.pdfIn PDF document text
    • http://chikatere.com/Upload/files/sisoxasufuga.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/razovo.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/rusomekenixopikuwijopep.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/91112028065.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/036609c5dd0331b8ff52856dcc31a9f5/gizowanokugi.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1630532714.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/gofageku.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/jatirejajobofizobuzej.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/13935115702.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/73866945037.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/fobux.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/tajolugakofe.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/xazefobowutomari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=android+10+pc+installPDF 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_off0000bb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5A 10532 bytes
SHA-256: 4638c8669c1711f92e02fa46253822d081833f37b8d8a994e2cf7878b28b960a
font_01_sfnt_off0000d370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD370 17104 bytes
SHA-256: 748366dc5382ad70daecc3d1df41c7e44dc978c51aa7292bd7556c1917d8d5dd
font_02_sfnt_off0000ff9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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