Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db28b584b695468…

MALICIOUS

PDF

87.9 KB Created: 2021-06-28 06:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 62935c3c5fe41380abc55d81425557b1 SHA-1: e16cb7fdb3d0d193fb9e2cedb710c2c241e93afc SHA-256: 9db28b584b695468081b7eff2ddbbfc03fcc1543d31f126842f5eeb187529137
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV both strongly indicate maliciousness, classifying it as a phishing trojan. The primary attack pattern observed is the use of a link farm to direct users to potentially malicious content hosted on compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://bsp-oblspl.org/ckfinder/userfiles/files/wakagexoda.pdf In PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/diwedobarap.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/d2b6ggup7q1re6bgkgi6noi4im/54920216824.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/2h4hlnese9tlvdaboku8qmffo3/36000382925.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16098b17d77fc3---lixujorufisowupililazowim.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ee496e985084941814b6df056d81eb70/77256372826.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/574b40e81acc32ddff9aef609f777f17/29558082404.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c871d71ee1---21806904882.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/69fd1504e96f8b14124f9e2dfb7cd419/55762322466.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/ashsnca9f9s2v1cugthinlms6k/26222814489.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/8727871306.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/basozipakugalesuxa.pdfIn PDF document text
    • https://hanul-muresenilor.com/wp-content/plugins/super-forms/uploads/php/files/pfuferhphhbftsk2ksq7qjq8s3/3118486340.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/22f5fbjogl2stq5i26c1tjtdqu/reladazuj.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/89317436277.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160742dfe1875f---nipalaboxe.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/d5b16060973ea30ebbf8b9324d44dcb6/47000113065.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/wipakesoxufuvidisedaledo.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d69237345a8---mamujo.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f47ddef9c---jiguluvomirade.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ffb34d128---mupubobagit.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/mel0fi5d8pl5qmbjrc7gdjrk90/59829934914.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/kasobojekazajubitib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+does+missed+miscarriage+happenPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF299 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB0 10892 bytes
SHA-256: fca56002a91ce0476be8ca5b2eec4361cb75d1f24a4b8f5175a70b3569c726a9
font_02_sfnt_off00012378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12378 17284 bytes
SHA-256: 84fd752a1f9ba2746adb58fcfb9672c3087996e9dedb8847bf81f5cf153fa24a

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