Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6657b0890f80e4c…

MALICIOUS

PDF

86.5 KB Created: 2021-07-07 09:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 18840d2d84ee6e2634687deeca33b380 SHA-1: a47f0eb386a58d906f3f721d032444170b571371 SHA-256: a6657b0890f80e4ce9845f4a263bff0d4427fcd12f464428ae88bee5571b17a1
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to disposable hosting or compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://archism.ru/uplcv?utm_term=example+of+body+paragraph PDF link annotation
    • http://wuxihemei.com/ckfinder/userfiles/files/20210703_090021.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/3294df49f45a6cc9b2655da8de33a0ee/15436647617.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/90550894196.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/kisuvagekuzatufinug.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a79da783226---gebijalipowexe.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/sebitoruz.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/16795787445.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/85326851455.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/kivenuvobomokilolop.pdfIn PDF document text
    • https://blugarden.eu/file/fiviwovekazupoz.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/63063617743.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/linapowizak.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6876b9805---92587757810.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/f47faf8443de0cc94e05ce6fb4a81bbb/50007293615.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/disigozebi.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b81edc9552---lifisifixukajupileni.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/10281798262.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160d21f75c166f---noweneviditomod.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16074d42420153---numodu.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/nekesoloranarov.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/41368300661.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/826c6bbf8fabf0fcb0295bb5398811d5/12870161264.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/1b2pt80t361h2lmpi2khuhqmhi/jifofatetaxuga.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/27558719951.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608471f86276b---21747865083.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_off0000eed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E7 10820 bytes
SHA-256: bb9e84780d62484ff3509827ecbc2fe7d6b2c9834a4505a4a62c658f6cb0e62c
font_02_sfnt_off00011f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F61 17356 bytes
SHA-256: 7560cabf227e79e7805413d7a4c344f79ad67ac546a52e697d136ac28bfab75d

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