Malicious PDF — malware analysis report

Static analysis result for SHA-256 18161d307fdca871…

MALICIOUS

PDF

76.7 KB Created: 2021-09-13 18:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efc3b75777da0046b256786ef0e60705 SHA-1: 21dd996ecb33df13d7bbc1ef167a41b747cd25a3 SHA-256: 18161d307fdca871fdd63c94d8150d6f3f67eb445c3f8b246458a4a701b027bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings strongly indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://www.southdownscellars.co.uk/ckfinder/userfiles/files/titagenobubipisibewogi.pdf
    • https://seas2010.cienciaevida.pt/site/upload/file/80121221174.pdf
    • http://xn--m1age8bh.xn--p1ai/files/file/90180180074.pdf
    • http://scouttautomotive.com/editor_uploads/system/files/monowebizisusuzujosav.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/talipezotab.pdf
    • https://traveletrust.com/basefile/traveletrustcom/files/jofunilogawatozas.pdf
    • http://planet-for-events.de/userfiles/file/2912755983.pdf
    • http://bangtutrang.com/upload/files/joponofemiribawana.pdf
    • https://bellcera.60km.com/upload/files/70649918346.pdf
    • http://erfaspot.com/resimler/files/79010831538.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613240bb8ae4b---84248336550.pdf
    • http://www.companyforte.com/imagenes/editor/file/52230335771.pdf
    • https://bushregenerators.biz/userfiles/files/birobawub.pdf
    • https://drinkpoint.com/uploads/files/luwegikigibuvitazomoki.pdf
    • https://lanegarrett.net/userfiles/file/77283417936.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7b5a587e2---xujamiketelorosalebitola.pdf
    • http://x-site.by/upload/editor/files/64710701018.pdf
    • http://lesrimaudieres.com/images/uploads/file/buvevarisusam.pdf
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/zirujuwikaxinagor.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a92802f13---fimobuwigokebulogojo.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613be51a9da78---26241350156.pdf
    • https://artistaone.co/userfiles/files/88853496736.pdf
    • http://utpcomp.ru/uploads/files/buvixusedubegitatoso.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=tvd+the+awakening+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_off0000c8e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E4 16792 bytes
font_01_sfnt_off0000e0f6.bin
48ed3cd68291493df585f5b8d2db295a669a0f67045a8e7e4a7ba88d1af01b7e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F6 17220 bytes
font_02_sfnt_off00010d66.bin
9d4ce9a791a5da0eaac68ef89e1d6c04f20f8bd99cded4566c4646dda93fe835
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D66 10552 bytes