Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fcdc81293e30428…

MALICIOUS

PDF

77.2 KB Created: 2021-09-02 05:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25a9a00521cba7902a71227d0d64474a SHA-1: 060e6a0ce5edafebf6bf3c099f3ac12c56af82d9 SHA-256: 6fcdc81293e304286a4c5db7b520cd7aeebd2fb4431887e58ed93a5e22e57bae
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. The document body is unreadable, but the overall structure and URL patterns suggest an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610081569037c---lunerusizijij.pdf In PDF document text
    • http://ahkjt.com/upfile/file/ranuropapirunebot.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085f149f3442---15465465654.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/kanuzedazadiviretutuni.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/zewikupemomaz.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f5968418c8222afb353e6289060792f7/muxib.pdfIn PDF document text
    • http://didula.com/img/file/gapudesivanojoximigubuku.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16075703812819---xubumupelufamake.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/11341684287.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612941772fb33---kijetipokozezawef.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45f3f70379---45541329506.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/dgbf1ip6402ck4aroo4m4as294/92690298666.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/71523658974.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160afae78d6820---42213505505.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/8f45c52894aa92f0697e5e802a0f99bc/dudesuvubevufi.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/ucs2u5ah59pq413h1l4mjvpbio/mukomudodubuxalofo.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4810bab81---xisevufup.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/9nlqdruatq89aa1oeeqq3rdm1t/98144222665.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/74439887456.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/lanaratuvotesat.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4f5ddf552---tixosipeguralasemin.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/zagifivop.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/27314413603.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d67c21df21e---jubokometaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=the+lakes+subdivisionPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC811 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE023 18204 bytes
SHA-256: 1131b0df11d845e0b425e4a88979325a76e6e303caa93c49965405c4d3517d8e
font_02_sfnt_off00010f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F14 10508 bytes
SHA-256: f8c79086d9340be18eb2bd24d7e28f1722f811cd7762976fdae86e04a56915c4

Open this report in the interactive analyzer, or submit your own file for analysis.