Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61f8b865f684a31…

MALICIOUS

PDF

75.0 KB Created: 2021-09-06 11:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2bf9cc85b1001035b5a5c7957782ad60 SHA-1: cb1d4ef0901e18c6737fba224203d3892802739b SHA-256: a61f8b865f684a31f178ca6159098d0e706094f5f47ed7ac28b20efb0ac1dc0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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=casio+fx+9750gii+manual
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbe18d0cd0---javagokikixutaj.pdf
    • https://guineaservicesproviders.com/gsp/files/beviwimipelalijofunibimav.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160c86d4903d08---70269963539.pdf
    • http://jrpst.pl/userfiles/file/77638140432.pdf
    • https://dycmc.com/DATA/upload/files/202106151600492146.pdf
    • https://medtek.vn/storage/file/xepizanimidizewobiguderax.pdf
    • http://mariangelesorrico.com/galeria/files/88888673056.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161133baa907d9---buxekezutawerokit.pdf
    • https://aspaeng.com/files/image/files/bonemenagusexejusozefe.pdf
    • https://babetravelling.com/ckfinder/userfiles2/files/kanatiweviriw.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a48e4c3a5f6---rudosesavaxonone.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607843006e09d---naxokuxisazobu.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c92db1f8a7---wezul.pdf
    • https://kermoulin.com/userfiles/file/lixinumim.pdf
    • https://laatjehuisweerstralen.nl/upload/file/67525605191.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/d60abbc8b86ab0b90204aa1cd771d6c4/katimujawirar.pdf
    • http://lechioutdoor.com/userfiles/file/woxiwonabejetiti.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7cc679eb5---20887686796.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e531bc8a07---5928400629.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bb6033e2c---naronaparusomifigananesi.pdf
    • http://gilendor.cz/userfiles/file/xavowaxufusaziwad.pdf
    • http://meyergarden.com/ckfinder/userfiles/files/xememoboxanobopi.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f43cf12d11---97953887424.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba82f15d5a5---xazizewamubetavas.pdf
    • http://kidsjeodo.com/images/files/pimalemigepimewusatuse.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c02e.bin
e5d808509bddc48be1f7855fe84bc0795174a4c87e98edd46987fb0a4aef1259
pdf-font-stream PDF embedded font (sfnt) at offset 0xC02E 17136 bytes
font_01_sfnt_off0000ecb7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECB7 16792 bytes
font_02_sfnt_off000104ce.bin
5607ae2c8436e3b207a12cc243843ec792aaee58ec3d5dbe5268e5abb7959190
pdf-font-stream PDF embedded font (sfnt) at offset 0x104CE 10936 bytes