Malicious PDF — malware analysis report

Static analysis result for SHA-256 1428f80f28fbf9c4…

MALICIOUS

PDF

85.6 KB Created: 2021-09-16 17:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09dc1f43a4b26ec3d38137d00eaee554 SHA-1: faa09b4b5c3b155b6590aaedf987d1c8f8062927 SHA-256: 1428f80f28fbf9c4b2f7087f1fe70f79510dfd0dd46fee157d83bf5192ba1eb3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of an advance-fee scam, presenting lottery or prize language alongside references to funds and delivery requirements. It contains numerous embedded URLs, many pointing to link farms on disposable hosting or compromised CMS uploads, designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://inwebjor.ru/uplcv?utm_term=how+to+get+password+of+android+phone
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/zuzenesekizosugawi.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/0f010e78647af88aac6c3427085b946a/laseparuvu.pdf
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/fiveduvirokijubed.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/3139d269cb7d8a758461cdb16821f365/69049370312.pdf
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/penusuzewupirafemojirozux.pdf
    • http://papaicountrylodge-longstay.com/user_img/files/xudufidigurefakenunut.pdf
    • http://esipro.lu/userfiles/file/80808638598.pdf
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/60727547649.pdf
    • https://drhuanghair.com/uploads/files/202109110219346155.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/e6da1709766edde4bf123e727bbbe307/xexazo.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f50ef1de99---79592415981.pdf
    • http://gniortho.com/files/Upload/file/niwenutogujexoruxit.pdf
    • https://fiberglasssupplydepot.com/userfiles/files/lodatanewibofegize.pdf
    • https://kangaroovietuc.vn/webroot/img/files/videpevifanefonu.pdf
    • https://marcvandewiele.com/userfiles/file/6485187471.pdf
    • http://bogaarchitetti.it/userfiles/files/wirivutolifupojemukoz.pdf
    • http://nadiadsa.org/userfiles/file/nuwanaserivedarujas.pdf
    • https://dm288.rs/slicice/file/32984844025.pdf
    • http://watthaistuttgart.de/userfiles/file/vovonulopekijol.pdf
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109122246209500.pdf
    • https://a2designbg.com/userfiles/file/7863922623.pdf
    • http://www.northern-japan.com/image/upload/File/80367030211.pdf
    • http://www.moyekolodin.com/files/javebesovuxe.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_off0000e99a.bin
4a07828285e5103ba6a93d3234cec1f2925d366486ab53427ce481b587425c19
pdf-font-stream PDF embedded font (sfnt) at offset 0xE99A 10808 bytes
font_01_sfnt_off00010249.bin
c29ced8517db252e32ee40c2ffb1a9dec8ebb941e1fc86341d92df8100a8b939
pdf-font-stream PDF embedded font (sfnt) at offset 0x10249 17752 bytes
font_02_sfnt_off00013092.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13092 16792 bytes