Malicious PDF — malware analysis report

Static analysis result for SHA-256 db3bc1750af27414…

MALICIOUS

PDF

74.0 KB Created: 2021-09-13 07:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ab753d32c126bdd5370f8856b9638135 SHA-1: 0ae40f28415d252a847cea35a768259e017b24e7 SHA-256: db3bc1750af27414401d2737b397eb4391a4b08391e0158cffba592ca26f96f8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised CMS upload storage locations and disposable hosting, suggesting an attempt to distribute malicious files or redirect users to phishing sites. While no scripts were directly extracted, the nature of the links and the 'link farm' heuristic indicate a probable intent to host or link to further malicious content, potentially exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://ozdoby-betonowe21.pl/Upload/file/vinopalutes.pdf In PDF document text
    • http://babijie.com/upload_fck/file/2021-9-2/20210902142831688053.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/57936024040.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/zowebevinadig.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/67108785191.pdfIn PDF document text
    • https://deepex.hu/hirek/files/7245295431.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/65625336297.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/3469338064.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/8155627592.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c03a407af3---14118198855.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/18572723288.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2fde14207---xoroxidejo.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/gagofetuwawapotuzirekibo.pdfIn PDF document text
    • http://polletnv.be/uploads/files/lobomopore.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131d7e068859---tatime.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/duzofijeteru.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/pobunuzanidelivegu.pdfIn PDF document text
    • https://adikmanis.com/contents/files/29032178253.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210908120701.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130497a5249c---latomilutumefugeri.pdfIn PDF document text
    • http://csp.hu/editor_up/balomulamijopov.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/zuvekenironudona.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/11916629158.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/36940180388.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/84498192885.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/rivedakufataxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ice+age+2+putlockerPDF 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_off0000bee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE9 10448 bytes
SHA-256: ac510e5a757ac1503e2e4ee682e20f6cd1b5efaa8660d67b65cf1698d3e5f42a
font_01_sfnt_off0000d6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DD 17144 bytes
SHA-256: deee9427b5801a194473eb49ab218abf77e28bf6136c3caf43a60e8fa2bc4797
font_02_sfnt_off00010367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1