Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc1f3e14cbf541b…

MALICIOUS

PDF

114.3 KB Created: 2021-09-01 01:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e3fb5a1296f66330834c73468f36fee SHA-1: b35f6f89dfc4078841c5788b9e5f3bdc73ec5c20 SHA-256: 8bc1f3e14cbf541bead69712e3361959fddb224aaa393b5a1880defc0e92661d
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which host other PDF files, suggesting a link farm or redirection mechanism. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' strongly indicates the document's purpose is to deceive users with promises of lottery winnings or parcels, a common advance-fee fraud tactic. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://zzps.pl/userfiles/file/xelofijagipudufumowajapak.pdf
    • http://www.tomasjelinek.com/img/pub/file/zezajifosufodowuvuk.pdf
    • https://mosallaesf.ir/uploads/ck/files/78597096047.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b2428b3c1---wasutipoborabarifo.pdf
    • http://fszhenjia.com/upfolder/e/files/20210828161450.pdf
    • http://rwdwebwebdesign.com/img-aim/files/61286373691.pdf
    • http://sam-global.info/files/file/xawukuxebegogarirazu.pdf
    • http://hillhouseclassof1961.com/clients/c/c9/c9b049383fb65e98d0a4dcab6c176392/File/sidogukeporijuzozoxejuvap.pdf
    • http://falconartistmanagement.com/ckfinder/userfiles/files/xovubedizuje.pdf
    • http://cukrarnakolbaba.eu/obrazky/files/tixuwasorij.pdf
    • https://schmitz.cz/res/file/7093024355.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bd16e8889---47771173468.pdf
    • http://aybar-gallery.com/userfiles/files/76009156424.pdf
    • http://kolesnikov.pro/ckfinder/userfiles/files/68956734476.pdf
    • https://sinhadventure.com/uploads/file/10336964706.pdf
    • http://memphiscentral1969.com/clients/865565/File/85003459726.pdf
    • https://soudurelauziere.ca/upload/editor/file/fapazopejepuw.pdf
    • https://jajugroup.com/ckfinder/userfiles/files/rikuvutipemufobo.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/35ab6h9kelm8390ne8e0k1ln22/nolegedepap.pdf
    • http://skolicka.eu/foto/images/file/kopawavalirivofizowadevew.pdf
    • https://bawwabatrizq.com/userfiles/file/22226895579.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/7089924507a602ba38e698d72b4fd8d6/3692006786.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/44ea7b0cdb86b6ee57b2cc83c624ee52/16820495763.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/e710dffccd11e1dcbf8cddc1bb8a1d71/roritopokusu.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/imhbo7ac1gm1qi2pompkucbs54/5428468701.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=another+word+for+come+down
    • 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_off0001599b.bin
f882dfb048c6de45a32ac86256a6c8ff1f747dd5a8f4e7735a14a927d8e4c303
pdf-font-stream PDF embedded font (sfnt) at offset 0x1599B 10340 bytes
font_01_sfnt_off000170cc.bin
6dfcfe407b5849bcbb1c780e88dbd37f6faaa55147a68f575685745f0b8996b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x170CC 19564 bytes
font_02_sfnt_off0001a358.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A358 16792 bytes