Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb606f2d4200d4cf…

MALICIOUS

PDF

97.9 KB Created: 2021-09-06 08:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 584fdb5a8fa617597edf35458037c538 SHA-1: 4bb7ffc758fd91dddb619c1b16dbe9bd7a183846 SHA-256: eb606f2d4200d4cfee3ffa959a21c40c4b1ab42f5a47bb97bdcecbd7d9ec987a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised websites and link farms, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites, likely as part of a spearphishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://medvor.ru/uplcv?utm_term=trial+marriage+husband+full+novel+pdf PDF link annotation
    • http://parzenica-bialka.pl/userfiles/files/gujuruwegu.pdfIn PDF document text
    • http://iworking.vn/uploads/files/19358267274.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dce100959---56419414292.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0a0d09e10---81256981883.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/dujibapem.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/72097523522.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5d3b7e2bd---zitewugekimub.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/o0ph22dv01j94i5o5sv82k0c24/buvuximoronasurogoja.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/70179388754.pdfIn PDF document text
    • http://teraval.cz/res/file/6314630128.pdfIn PDF document text
    • http://alkimosgb.com/userfiles/files/52546407143.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084dbe9442b1---piguv.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/13466222888.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/fogawenakonejamiwi.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/kusinot.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/65591550703.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/30d58ca1252a69964fdfc931cfe5e97d/nosob.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161236ba4bd527---8529471002.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/31793699681.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/58138399625.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/op6b50j17km10h3dq0euv08bug/peragexas.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/lajomixudipiwobi.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/r68pcnh3gioi6i7j1hltf09bph/40556493836.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/73099035465.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001182e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13040 18384 bytes
SHA-256: 8aaf11f12bebb66715c8700cfdcbaf47ffa29fe83306c0c4f34a7981237e49dc
font_02_sfnt_off00015fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FB7 11116 bytes
SHA-256: 2b833a005745fc631c2012528d31d00167087138a181012c3cf7b40b451eb96d

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