Malicious PDF — malware analysis report

Static analysis result for SHA-256 803faf81384ea6e7…

MALICIOUS

PDF

88.7 KB Created: 2021-09-05 14:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d428a6ef6ad4d66368eb10390480021b SHA-1: d98c57f04de22003d5655a452a4da2749b8337f1 SHA-256: 803faf81384ea6e7ad59006734cccc7b21c8679a09b28348fb99ddb8fdc279b2
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress upload directories. These directories host further PDF files, suggesting a multi-stage phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4449a0f9bb---selilosipa.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/7a93c55b289cfb0d82ad22e1fcd336da/32621821187.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16082f014a458b---fedudobaw.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2faf1ae5e7---24218148047.pdf
    • http://cokhiminhhien.com/media/ftp/file/dedova.pdf
    • https://escolaalfa.com/userfiles/file/zexukogakavunelewomoperub.pdf
    • http://kpotplace.com/uploads/files/dafowutatixapanibedenaseb.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/cfb66084cbbc37c437f84753a5332921/sazataderamutedemikese.pdf
    • http://ecole.ru/text/images/file/69832557874.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c5069e43f44---vaduwab.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094d54401dab---tuzobejobom.pdf
    • http://botosani.ro/img/uploads/file/gamimomape.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/295038ecc536a50d04aef4f043974bc5/madorefofuraves.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/63c231bcfaf3263fa91955c91489a576/vuwedud.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c2c9c4fb20d6e5edcca1d9384a7f655c/95776282753.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ac43799c66201867aef050cc84bb4544/ragomimadanesam.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095e7aa86a91---naroxufojonujimo.pdf
    • https://editionsitaliques.com/userfiles/file/vizaxapubeloxof.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/457ba02fc73d450fe4c989a73ee3edac/45968151974.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/19c742beaba8020d671e2a66abb902f5/49399176732.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc3fcca3a9---40516383912.pdf
    • https://www.tvmreza.tv/ckfinder/userfiles/files/lijudiduxefujuva.pdf
    • http://bukhatirhomes.com/userfiles/file/22042340713.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=understanding+and+using+english+grammar+advanced+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_off0000f380.bin
0a823ddce735a66d247f41e0737110f7b9939adecb317974c59d28fe2805e458
pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 18476 bytes
font_01_sfnt_off00012364.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12364 16792 bytes
font_02_sfnt_off00013b7b.bin
8b4dc12d9c60a719dedfc5d1e518c8cf7560b028a49fbf44c2ae3505b7bb0418
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7B 11120 bytes