Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cdcdd224c38bea5…

MALICIOUS

PDF

87.2 KB Created: 2021-07-06 02:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44d06a8b35f27650cc74c6faf7b68f77 SHA-1: 18ff18fd14b99e3e80468b942ec51b67437a0afd SHA-256: 4cdcdd224c38bea5f94871a0274981648314bb2c14a94cf05c794c501cd3891b
196 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' confirms the document's purpose is to trick users into paying fees for non-existent prizes or funds. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, serve as lures for this advance-fee scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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://anhuizhkj.com/upload_fck/file/2021-5-5/20210505111833801064.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df0c9d38223---nutizitudome.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608542ccde0e9---3175722142.pdf
    • http://dailymaytrogiang.com/userfiles/files/zawujazuxesegu.pdf
    • https://bulendengin.com/upload/ckfinder/files/fijuvenepamuze.pdf
    • http://hasici-pristroje-eshop.cz/files/file/20727553870.pdf
    • https://arerp.kr/data/file///dofalaximeron.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11fa247033---43613999693.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763730b29ee---95214605427.pdf
    • http://alarcon-v.com/editor_upload_image/file/kusifi.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fc9df3a0e---13450750243.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94b68b9703---paripuginazesasiwun.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1ee4cb09e---89898832169.pdf
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/2229416232.pdf
    • http://ks4073.com/file_media/file_image/file/9508118539.pdf
    • http://alliance-ltd.com/userfiles/xexudixexetupodevanunoj.pdf
    • http://ceskylakros.cz/userfiles/file/mifapunotulojiwavuxokakut.pdf
    • http://absigorta.com/E/file/mipatanavadadevedi.pdf
    • https://kitapkapla.com/upload/ckfinder/files/mewejolojafote.pdf
    • https://irantruck.ir/data/file/noworudolodililexazi.pdf
    • https://pensiuneavalentina.ro/app/webroot/file/48020883927.pdf
    • http://geoodwierty.pl/files/file/biwimizepasusuzikusosufo.pdf
    • http://smartarts.bg/userfiles/file/bikuvanozedufekupoba.pdf
    • https://attack.lt/images/files/xurasumapiwajafiwoji.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a0ff2b814---69044352448.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+get+ink+out+of+a+blanket
    • 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_off0000f2b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B2 16792 bytes
font_01_sfnt_off00010ac4.bin
a859cb6a9c65da2b1f32be9cd938bfbb03ab059ca229afe83ceb949c42b59ded
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC4 17124 bytes
font_02_sfnt_off0001376a.bin
688e6c159fcf3a254a24a13edbf22d5f4573fde91a4124cf92ed923e9957bae6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1376A 10532 bytes