Malicious PDF — malware analysis report

Static analysis result for SHA-256 3404b7086d70fea3…

MALICIOUS

PDF

90.6 KB Created: 2021-09-07 10:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 497986b25a9e5bf860379551e0beb6e4 SHA-1: 8101d5cc0ec626e543718934365e1dac9c01b554 SHA-256: 3404b7086d70fea374ab50267fd4b7a6d5bad12695a7b4377692870bad20c6e5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=breville+smart+scoop+ice+cream+maker+bci600+manual PDF link annotation
    • http://spreewaldatelier.de/img/editor/file/kisusexoz.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/c1rant23aspbs3kt4getjsgikr/50419098867.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/26178261907.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d62e0c41527---42263663555.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/vikawawezonipixulab.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/selodimojuj.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b7dd2cfb4---27187310533.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/31403467699.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/7bds0sf3q6v2d6m7mc47ecc253/36086009168.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/47091365960.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9078ae52dbc9c0611c535a3205485934/38388568302.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161320e37e55b9---90260333569.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090c0d94fd46---dunogo.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/35783005220.pdfIn PDF document text
    • http://labonscafe.com/userfiles/51698051684.pdfIn PDF document text
    • https://mimpiindah168.com/contents//files/79852235517.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/e439gl2j4hf8cuf3gej06bucr5/58281609505.pdfIn PDF document text
    • http://www.radiooro.com.mx/media/images/uploads/files/65803411428.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/wakil.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/64901611427.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725824561d7---vifawuserokurolinalulo.pdfIn PDF document text
    • https://signika.pl/Upload/file/zazizerovovux.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612bd9911daec---37666117525.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/wabeti.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/21151074364.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDD 17316 bytes
SHA-256: af82cd2c9bd27faad57163e2b9fec35dcb19ab32d4d024c550b49cd395d0ad63
font_01_sfnt_off00012a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001429a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1429A 11276 bytes
SHA-256: 753caa1f6a3983829f0ea00f1ce46f1b1317b884405266fe46a220a4094e0f23