Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca4d39e7a5bf2dd…

MALICIOUS

PDF

96.0 KB Created: 2021-08-29 10:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9e15c500c175e7145c92dcd5ef94109 SHA-1: 6f923147487e49ef00fc30d1a274c3b41db176c2 SHA-256: 0ca4d39e7a5bf2dd7c874df6223091b48436c282308895a8549205a2bbc201a0
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further indicate malicious intent, likely to trick users into downloading a second-stage payload disguised as a PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 8

  • 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.
  • 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 https://irlanc.ru/uplcv?utm_term=how+black+out+text+in+pdf
    • http://noithattamphuong.com/upload/files/25874861415.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/dajebo.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3d2b81420---16096351664.pdf
    • http://autosklo.sk/pictures/file/54997238030.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815b06e57c6---87123116026.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16098be8c248ea---xutur.pdf
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/dudifefa.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/4gphc1jj8mhm1n8vde58fckcp6/tefunonowutala.pdf
    • http://emeraldcovepartners.com/_data/images/file/45009174823.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac93a54e674---63628237078.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/a1f138a332ac760aebefb1fe7833c1b4/mefinixubegare.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/rdcecmvf30bk31j49nhe05gm06/37976425953.pdf
    • https://hosvagyok.hu/userfiles/file/28927664884.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf72decd56---43692118509.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/pupadatapulizojepexa.pdf
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/lidiparizoga.pdf
    • http://ubytovna-krumlov.cz/userfiles/file/8562906789.pdf
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/xowipuvalubululet.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/dd1ff41d48e4aac453d60bf59faa63fa/xonamajezatopukokolorus.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/rs0om3ulbepdokn4ogb0oddg6j/ridufemux.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16073cbb5e9ed2---boselobuzuroda.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/cb79sob3gok9nbf6vnqe46ndn7/35754279464.pdf
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/dofinid.pdf
    • http://laptopcuhaiphong.vn/upload/files/mokesonobu.pdf
    • https://dialogueinpraxis.net/files/docs/xisapusibebusafizu.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_off0001112f.bin
330e154b210f4f6cdea05d5f55f15b19f2fea1f2a4d4e9bb5758383871693977
pdf-font-stream PDF embedded font (sfnt) at offset 0x1112F 10856 bytes
font_01_sfnt_off00012a35.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A35 16792 bytes
font_02_sfnt_off00014247.bin
4e0d7e330b321c129322a11cf47032879b0a415c2f48a0932c25294ed4ab60cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x14247 18000 bytes