Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d28697ccb9833f…

MALICIOUS

PDF

90.6 KB Created: 2021-07-01 14:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 830446f5d039d4f6cba1b9b547b14bd8 SHA-1: cddb47686c80e3e4ca157cedc080a2b0f83f5e98 SHA-256: 45d28697ccb9833f8db00d3fecfc4144c4bbde37e6ab95fe59bc1c37bd53b4ab
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack vector appears to be a link farm designed to redirect users to malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ef30k5gi7aclcjq1q3m6p2hspl/ruxidakeminani.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/41159759572.pdf
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/44539225324.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160acf46d25092---dagizenamo.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085d0ffea967---tijamujumakivolutuvuxixi.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/6da9d95f4253c00411aa904f7afacb8b/71248134343.pdf
    • https://eastmanllc.net/ckfinder/userfiles/files/lufukusowobutewimawudixez.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/4662f4a0739310c93953a49371921d7b/kugedoniwito.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a361d6e8a3a---lafijazaferopanugi.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/613dee889cf644c2605a0dd6195d88a1/60539454300.pdf
    • http://aquatherm-graz.at/files/20271256493.pdf
    • https://eventspicer.com/ckfinder/userfiles/files/wubuvo.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafb9eea304---19134983107.pdf
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/buwesobo.pdf
    • http://timavoshipsupply.it/userfiles/file/pinakeniretixojine.pdf
    • http://motivationandmomentum.net/ci/userfiles/files/65035963721.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/7185b1d807793386b4715789d4b8b16a/50619800023.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/c08141c00d25e7c1b3e34b624c522c5c/53593766729.pdf
    • http://minutemen-jrotc.com/clients/84940/File/pazomupurofunepokixo.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085e45829ca8---84260506184.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16086fcdd7f129---ravusanopijemuzevi.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4405eae702c10941c974d9d572687ac2/7096711460.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/8865d3ff35a4aaa3edda8d8473876842/tapasasuzofamowoxerewaj.pdf
    • http://mkngsp.ru/upload/files/11978330513.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/8f3707676d9e8c0c0ec58942e296b54f/dogakubezizikovituresigi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=red+winged+sparrow
    • 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_off00010024.bin
98a9c299b7660bb31cbfe7c1cf2c24907b369d8aae2dee3835bbcf6bf9871ef7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10024 17240 bytes
font_01_sfnt_off00012d0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0F 16792 bytes
font_02_sfnt_off00014526.bin
055d8b00913f3ab031f16bb6ff4a1df766dd543c84d60f66d0a6ffc06c1ed0c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x14526 10556 bytes