Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c03860b1c1baef…

MALICIOUS

PDF

82.2 KB Created: 2021-09-11 05:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b41878738fcdf850b48af71207b0bc5 SHA-1: 5f53b1d76efdb95d9495cfd3b9d8760069a268eb SHA-256: c7c03860b1c1baef40c9ec90c4a961d5abd705665a9e3e7105906734c3f54e09
212 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of an advance-fee scam, using urgency lures and impersonating parcel delivery notifications to trick users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing payload or malware. The numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting further support this assessment, suggesting a distribution network for malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sushimura1.com/uploads/files/77078822235.pdf
    • http://kolbiko.com/images/uploads/file/vovudoxijudepozegujare.pdf
    • http://belloverde.net/emailer/file/rabejimesigukux.pdf
    • https://paradigma.bg/uf/file/10342984295.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bddbd2f181---11884360601.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372b81b44a4---vawosete.pdf
    • https://invision.buzyhub.com/files/mupukugovoredom.pdf
    • http://paulgraphics.paulsfashion.in/files/wupilizegefis.pdf
    • http://gonvvama.net/filespath/files/20210904013530.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613188be5b982---47435757024.pdf
    • https://hotellemaritime.com/hotel/upload/files/fitoxaxipumipiwored.pdf
    • http://www.armstrongre.com/files/files/22882808783.pdf
    • https://emmaushuis.org/pages/39937767954.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/pgj1v32u2qiojqikr6ktvlg3h1/63837163787.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd56c368f8---72256448175.pdf
    • https://sgicorp.com/userfiles/files/8952280682.pdf
    • http://alfatreyd-mebel.ru/archive/images/file/madutewubodabakurifitib.pdf
    • http://turinhotelcompany.com/userfiles/files/zegisovurebar.pdf
    • http://studio-orlandini.com/userfiles/files/70685571212.pdf
    • http://goldenpeak.it/userfiles/files/wevok.pdf
    • http://haiannweb.com/uploads/files/tinimi.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-9-9/20210909170246545441.pdf
    • http://savemaxint.com/files/file/labobenuwuribosaku.pdf
    • http://stringquartet.biz/web/images/fck/file/fomedebaxogipemamavexuw.pdf
    • http://rund.cz/UserFiles/File/potenajiz.pdf
    • http://primebrokeragetx.com/ckfinder/userfiles/files/85814404892.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=only+gamers+apk
    • 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_off0000dd20.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD20 16792 bytes
font_01_sfnt_off0000f532.bin
e23d8ca065f5838db748fd47036482472c09ce8e90f3d44d18f6295db6d7591c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF532 17832 bytes
font_02_sfnt_off00012328.bin
d3e4a789ae024fed59054e493a0a463e65e2e326aec9885123d417608372c375		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12328 10516 bytes

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