Malicious PDF — malware analysis report

Static analysis result for SHA-256 5819ca7f18ce2b3e…

MALICIOUS

PDF

84.6 KB Created: 2021-06-29 00:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81f39531ea463adba618e9e17232be36 SHA-1: ad933f621d962fda89220a177ad145fe1225f4ea SHA-256: 5819ca7f18ce2b3e487c861651690c94f048a8d0a257846bfbae54442f659d9e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other potentially malicious sites. These links are likely intended to lure users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/2nrivio1v3vb5biapj4kbqkcir/kosetuxiwetis.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819d8d000d1---semuworaxojerovuwe.pdf
    • http://angarakshaksecurity.com/userfiles/file/66633822498.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/b617319b6c64dfb3eed737707e6fde3d/tewuwamanemojaj.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d4a321be6---59167895418.pdf
    • https://ipic.vn/userfiles/file/bexoxoj.pdf
    • http://homenet-spb.ru/userfiles/file/59090039844.pdf
    • https://foulardfotografando.it/file/runotom.pdf
    • https://hasekei.jp/userfiles/file/25271581806.pdf
    • http://travelci.ru/ckfinder/userfiles/files/81352951636.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fb2044363---guvebokekupezupemaxotajiz.pdf
    • http://greece-ex.com/images/blog//file/80777716780.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608845f3280bb---35897888989.pdf
    • http://provia-events.de/pics/fotos/1/file/56971811575.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608232c8c1587---dinoxunesol.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/024e9bab2d2caca242d20c9ebed3da3c/58937026747.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/jkb2m72sjmojpb913s32hq9ii0/30052438115.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072be666da9f---vemekidokafokite.pdf
    • http://ciccioinpentola.com/userfiles/files/18168371414.pdf
    • http://esoftland.com/userfiles/file/fojuwebemeroxogelonojuv.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160918850c9899---gaxibediv.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/plh6id8gf2isu6jkcq40eseml3/zutog.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/411c22deb52dc59ecfabd952f25ed825/puvuv.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/57b96492feba13ca8df641979cf91920/47493820583.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c39a75241---27053735602.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=web+page+example
    • 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_off0000eb29.bin
f11392e0669678669dfa5892774107daebb5f34f619fbe9c89e9e163f7862616
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB29 10148 bytes
font_01_sfnt_off000101a1.bin
95c7fea456fd606024bd17f3895eac74fef2e7e4ddfb21042554b57989eef30f
pdf-font-stream PDF embedded font (sfnt) at offset 0x101A1 17076 bytes
font_02_sfnt_off00012d59.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D59 16792 bytes