Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5712daf2b62b7cd…

MALICIOUS

PDF

68.6 KB Created: 2021-09-03 19:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6ddd993af1a0746f464edbe841ee2b39 SHA-1: 21e53a2fbc2ad8180759935a4289a66eade04b65 SHA-256: a5712daf2b62b7cd853c0381e701742039c9a56156886a3e1d2dd2e883bd2493
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://philabc.ru/uplcv?utm_term=vauxhall+astra+excite+2011+manual PDF link annotation
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610c4a97e2de0---mifejela.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/47400450817.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/fesolidagibodipudedi.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608436077b669---podusewitagojipariwip.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/86107354964.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/jusokunebepugoserubux.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090be1f6c769---jojir.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/c56debc04501169987076af2682d760b/tabozezojiwomili.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/fukufifivix.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/ck7c82ap4ignvu3v4ckuoiipcg/jabivufi.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b5c13135374---jitugikadubo.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5473395636---zabetexeloparefaj.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af596110111---32139520885.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/5614163bb214f567ae5ee444360ec69d/88093430858.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e756668b81---robugudozular.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/1a9lchmnk29co462jo4kck7h66/vakogetok.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/9b3skc2bgtcngjb2u5maus2rrv/36433222134.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/57085ec0fedf5aa096da3e34ddd6e355/98117971539.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/fpl19dngvhmn4lirlgqsjqpede/favidejuzupesepexisixi.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/tt41v7s5jbtp2516ksuuo7552j/40798405523.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/58288158659.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/962324473.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fbf843543---wosusimuwutodopoma.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_off0000b0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F9 13624 bytes
SHA-256: 1cf0ba7364e4dc54a85c308c7aafda43cf7c9fefbc635ff185220868d726e8ee
font_01_sfnt_off0000d264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD264 10840 bytes
SHA-256: 69fbc0624240070a51c8b81987e35c44c39299cb17c1470899186e6f5b1a4757
font_02_sfnt_off0000eb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1