Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbbc0070f938f839…

MALICIOUS

PDF

97.0 KB Created: 2021-06-25 12:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 00e17af2909bd49d49921a73d13db491 SHA-1: b113cc4633dc8cdeee17681050fef08fa26554b6 SHA-256: bbbc0070f938f8394b9f5aa9126c501156456a50214618edcd9be71609903875
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of multiple external URIs and the 'link farm' heuristic strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cructi.ru/uplcv?utm_term=olympus+digital+voice+recorder+vn+3100+manual PDF link annotation
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf7ea9f009---zitamuzeferatiranaz.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/xivabexibajavugekalud.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/pdtcheq2m19u3tqjn5h3ht5tlq/bufuvunosesili.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/eef50ogqmh46324elnnghleqsp/33652415111.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d00dd46bec---nopusemidevapaletaza.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/96594328544.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/99799488827.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/60b2da1a535f0aad47eb32a5fa570d14/moromemud.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8019c6afdc---26920342404.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/xuwufosamafixipes.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/16858910037.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/87837140069.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/c335f03f2fdc5053243fd3945db3fc32/daxoxurevenilazirogusefod.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/surabosatojamivuruvero.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940fbf9fbab---2815091687.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/darufap.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/b061192c30b69b13e5fce7bbd9ab4b2d/lowikuxilupidobojagapika.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2A 18720 bytes
SHA-256: 05102d373bc0a9d013b1083de0ce487d0e51299b0207473431ccaf5117249f91
font_01_sfnt_off00012d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9E 16120 bytes
SHA-256: 09562ca2d5000ae2f2345c4ffb282664df80e6add20478162cc85c395b82892d
font_02_sfnt_off000142f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B0D 11508 bytes
SHA-256: f6abfe291fc4f7ca920d63589a7a455d087d4af6e1f086ce71c6b9c189174629

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