Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd94e9881fcb992b…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 18:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d4e442f0dfe4295ee28da2cd45e7e415 SHA-1: 72600d2a59d407451f37247f43aa51d3b2442663 SHA-256: fd94e9881fcb992bcba6e5526bcc6290de17c4039eade3c99135211b8dc4da81
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The embedded URLs, particularly those related to 'how to access other phone screen', suggest a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://thesprotia.gr/uploads/file/7957060026.pdf In PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/lisexaweg.pdfIn PDF document text
    • http://nincity.de/inline/file/17907437582.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/88585815553.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/49156081742.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/8e089pcfoa4nn82g4inck35u13/pilumimuvekapa.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/36808068506.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/93716031640.pdfIn PDF document text
    • https://kimcert.net/E/file/teravawobobumimiraj.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/dononuluxudebular.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/komulepetiribuzimelujuli.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/rigomewipelaketidugirekoj.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613da7b74e9bd---duzewozeredagaxek.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/fujati.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613312dab5a4d---kisesagapobilivav.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/detagusevedalipe.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/19689494558.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/xomala.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/fakarapakuxo.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/db72f91761b13334ab1bfc3de07dbbf4/42261552926.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/43059151537.pdfIn PDF document text
    • https://semut73.com/contents/files/vupenak.pdfIn PDF document text
    • http://vkts.se/userfiles/file/99437050498.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/kisuregutuxiborefeguzima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+access+other+phone+screenPDF 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_off0000da49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA49 17584 bytes
SHA-256: a0d30335da8d226162a422d4bda8b5de0ad51b0d0917812e018fbff27e06f1b7
font_01_sfnt_off000107b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCE 10412 bytes
SHA-256: 0f2ff94a160c213b40738b44d068aab3bb6a69ecc9c311693431939f6ba3934a