Malicious PDF — malware analysis report

Static analysis result for SHA-256 086721c1b29a2e29…

MALICIOUS

PDF

71.5 KB Created: 2021-08-28 23:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 376e39b02a98c231ce374666b855ae4c SHA-1: 968522f24ad96ebbad1f3f8cba586b337c1eca94 SHA-256: 086721c1b29a2e290c6b346cef0d8043e5522e43ee78c6ead597a0c49f98b873
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. Although no scripts were explicitly extracted, the PDF structure and link farm behavior indicate an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://saikunghouse.hk/userfiles/bipigedudasiremesan.pdf In PDF document text
    • http://sva-jeanroze.com/xmedia/file/boradevolukemegotugijax.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608692ca00644---85048501271.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/6cf4de6a361dd249d9602911a6490425/maneb.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/80057816732.pdfIn PDF document text
    • https://tepihtrava.rs//files/jafetufutibegutob.pdfIn PDF document text
    • http://torgoborud.org/images/file/lamelobatenilobakilirig.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18d3de5262---pukupajexunef.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/46130082731.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3033064a4---59423881866.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f14b303daa---vogegurujox.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/060201077465.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/fbat5qb1vfuoqbquk961tp65m8/galudoxuxapib.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/2ab55dbadb1ccd4a439051f226b494be/9288698058.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/vitakixovud.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607c30381beee---wuwinod.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/02223vkibr3tdtvq6nm5lfd2bk/93575617355.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/17318281967.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/72039998183.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/fojetupoxipetab.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e973f232b00---vuvetujazarigogileg.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/1d4c47426c3c88a5d17cfa8d5e3946ff/zilirokosu.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/c32a3q80c0hvc3dlg0bldhnim3/bizovifojiwov.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611abba0aefd4---44214852569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=fore+and+back+bearingPDF 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_off0000b9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FD 10444 bytes
SHA-256: 15a007d492e9209c07714073146537ab5573fa791af4cbff41f4007cb2c0195d
font_02_sfnt_off0000e97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 15496 bytes
SHA-256: a8bee82aa098e0a35fa56921da000d2d17a394cc1631d8040ef610351def3a7c

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