Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a576e35d2b4946…

MALICIOUS

PDF

85.6 KB Created: 2021-09-05 02:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fed1a087b2bed6288cbc1e629108495c SHA-1: ee1ae47526e1a9aab2cff314df106840cdec5b27 SHA-256: 79a576e35d2b49460c1fa978d555cd29c245be2e56ce38d0d1c62651d293ffa1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The presence of JavaScript suggests an attempt to execute code, likely to facilitate redirection to malicious sites or download further payloads. The link farm structure is a common tactic for phishing or distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/ea4dd4c8d653d885df0e904ab8404325/vexofoxedevidafelekumof.pdf In PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/nowefazatijewokuledafabij.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/8779b609cd85c871283c15ea0120808e/sadubaginopotiwovagoguj.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/0e3b29d6e0e69dbbab3b64589ff72895/81733036180.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/85419410835.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4e81a3868---vebupid.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/42325919278.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/087874bd296ff2dccb7efeed17ed694d/50129793791.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/1852058569.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/80084062387.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/98842893964.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d4492f5942a---gobatewebirazovad.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/lqdd4hdmj0phf4c7ns2l1tgpg5/68850181917.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/muralivepolagajopewizumik.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/7670901183.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/dde8efcf55e7541f8b655dfc7ffbf59f/nexovawuzurenaxupogexe.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/40291262604.pdfIn PDF document text
    • http://gumberryoleschool.com/clients/33891/File/99149186539.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160e62bf225e18---sevabodobidedabuseso.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/jiver.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609203e9cd41d---48863992388.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/29527379606.pdfIn PDF document text
    • http://jfe.hk/userfiles/10600528774.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05b1555664---mevevorizo.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/83981260575.pdfIn PDF document text
    • http://zenithmetals.com/files/sasurutepukunekufozapo.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/xekigugaxoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=handbook+of+adolescent+health+psychology+pdfPDF link annotation
    • 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_off0000ea04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA04 11044 bytes
SHA-256: e89702641a74a3d9f05e525baddca0d3c53e7cc01218be448f398e42078bb012
font_01_sfnt_off00010346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10346 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B58 17832 bytes
SHA-256: e85db5cc75a2fb0db03cc88a66ed4ba6debcf37ac8297cc59185544382cbbe60

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