Malicious PDF — malware analysis report

Static analysis result for SHA-256 739dadf2dd8fd2b7…

MALICIOUS

PDF

95.4 KB Created: 2021-09-05 05:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5568eed99606d41e879ea881aa132c71 SHA-1: 762875dda3e02f5ed2b368b907334d4ee11e7271 SHA-256: 739dadf2dd8fd2b711269c8935684187b9f9133c0d42ac0cbb3829e798da0752
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV and an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to potentially compromised websites or disposable hosting. The presence of embedded URLs and the nature of the link farm suggest an intent to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://infrive.ru/uplcv?utm_term=hukum+mempelajari+ilmu+tajwid+pdf PDF link annotation
    • http://hanhthien.net/uploads/file/tutinofadonib.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/51135208268.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/36107372155.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/a962010bhlceocui9ml7n7c2eb/dokuzusilonijonisulomewu.pdfIn PDF document text
    • http://sns.hu/_user/file/41030118019.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/26092586902.pdfIn PDF document text
    • http://kimthienbao.com/userfiles/file/60845766366.pdfIn PDF document text
    • http://firegallery.ru/img/upload/51374120021.pdfIn PDF document text
    • http://lg-palette.com/upload/files/joruxedeb.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16077845978851---2158848409.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/7rjlid2hmlc42e61a4s77urj11/16416215052.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bc5b02189---71720116601.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/3392eceb42fbd2b1fc628ee00900ece8/wuzipedulop.pdfIn PDF document text
    • https://vientangluc.com/upload/files/lilefafazakug.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021062806102573499.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/70680481515.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e8b542fd6---1231870530.pdfIn PDF document text
    • https://premiumtrade.ro/ckfinder/userfiles/files/baligufenamozasejuwiw.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/fisuri.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/20517124347.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/xemajupaverikokor.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96abe8d751---80875582744.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/76806075568.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000141ea.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x141EA 25332 bytes
SHA-256: d2f5705e92f276020018779051e35019f2270fd7094651370a029d18d5c882f4
font_00_sfnt_off0000e690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE690 10664 bytes
SHA-256: f0b3627c64aa7c698d19e2cd16db3c6cf0f6116550a2c1fd6d6dca3dc11ea7b8
font_01_sfnt_off0000fefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFA 16660 bytes
SHA-256: 5c239214ea39c2160f25a7b7cbdff44895b0b9878acfb22087c4abb7ba80b446
font_02_sfnt_off000129d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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