Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f7156a7a84eefcc…

MALICIOUS

PDF

79.6 KB Created: 2021-09-15 17:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bc88d46b7a8bc4abb175061392a29ce1 SHA-1: 30040a9eb5a5e2656944893dcc2f19d194ed9b88 SHA-256: 4f7156a7a84eefcc369a6f7bc8099f593aee04d41ab679933ad0fc029954a746
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple external URIs and link farm indicators suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://allytemp.ru/uplcv?utm_term=head+ball+football PDF link annotation
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/87574061934.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/nuwazotawiwep.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/tasilajeboliwekogodijazo.pdfIn PDF document text
    • http://hidramaco.com/files/files/rizuvananamil.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/feropoxosoretesu.pdfIn PDF document text
    • https://matratva.in/userfiles/file/lufigezuwiruru.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/xosexivaza.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16139fbd51e16f---55240407024.pdfIn PDF document text
    • http://progetec.org/userfiles/files/73848470091.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/80181728196.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/5030928519.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/88778362226.pdfIn PDF document text
    • http://africareview.in/userfiles/file/dalazipebevezigi.pdfIn PDF document text
    • http://tercovci.cz/files/file/zedorewugifamuzokoku.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd808dd212---woxutozedevabuvuzosul.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/64594467747.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/51478521543.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/renupudavulenu.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a431d87fbb5d42eb5028ed62b5c3d774/66462912538.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/28783460847.pdfIn PDF document text
    • http://15881588.com/ckupload/files/75461447197.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7433284225efe9ea3ea3baf8190eee77/67705430281.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/35892765191.pdfIn PDF document text
    • 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_off0000d71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71E 16768 bytes
SHA-256: 9fe4c45d3b417002450c2e4c2ebc6c072acd6b11d069cc254c49465717f08e5f
font_01_sfnt_off00010299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10299 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB0 10012 bytes
SHA-256: 506c88708a14f83173c0ced343ea2ac74e6c0ce0006e69e3cbe689d81dd50049