Malicious PDF — malware analysis report

Static analysis result for SHA-256 b432522321bce642…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 14:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 38e1a1895ba3c8e35d8d08db99415efb SHA-1: 5b8a5e72eed8ce6189b9ceef53458838d66c38c6 SHA-256: b432522321bce6421bbd28e818cb004306849de2ee234b0e99bb87933d2c79a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krone-murten.ch/userfiles/files/tanewanuvukunod.pdf In PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/rarifefe.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/zibixufunusapawogejegoba.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/rujoviwutelok.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/57655079320.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d6b7abbc808536cacbd0372168b5aea7/jakerimenigulazasunibutut.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/gesobujujine.pdfIn PDF document text
    • http://katheran.com/clients/55933/File/tenakasopumofosulewajig.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/adef825f1ff058cef3bbf2fa6e64244d/luduletijevuwafedenozoz.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/kafobojuwitofaxu.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/3296860850.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/jevimusobutufobujuwu.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c4912697b3e---15169745451.pdfIn PDF document text
    • https://cowik.pl/upload/jotofekusaloti.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/92997298433.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/ratewapawepufafegojupep.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/66272015650.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/devipaxalozul.pdfIn PDF document text
    • http://ipllaser.in/uploads/74993325988.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210530041727.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/11840285196.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/sikajoxijewo.pdfIn PDF document text
    • https://schmitz.cz/res/file/kujupowoporelet.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/divur.pdfIn PDF document text
    • http://bienenaktuell.com/sites/bienenaktuell.com/files/file/1060333799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=divisor+de+tension+ejercicios+resueltos+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_off0000da0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0E 10748 bytes
SHA-256: 6bed34ac0a8d2848acdaeaa48b44e70c01e145c3afd5e510eef9b945855ababb
font_01_sfnt_off0000f2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DC 18968 bytes
SHA-256: a418e61ef20861af306615e83ea81a7fdde0505407a65306e700f7ec2234bba1
font_02_sfnt_off00012349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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