Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0727d05d545914e…

MALICIOUS

PDF

90.6 KB Created: 2021-07-15 14:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ecc8cc8efd88263f6fb7f9992cc34a9d SHA-1: 6b2a04394bb185964e5732177a0e41ca14942bc6 SHA-256: b0727d05d545914e86e0c0a1df5a3d956a5e024edaa001dd57c04c72774e01d8
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. Heuristics indicate it functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS uploads. The embedded URLs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608380199b2ef---zurulasadakawofo.pdf In PDF document text
    • http://aklond.com/UploadFilesfile///2021051322002357.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/87256772300.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/18519990935.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075c1cc8aacc---tikomidarere.pdfIn PDF document text
    • http://phuongninhphat.com/uploads/userfiles/file/gigipepufamumet.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85a9c54a2---ruvalizumudiripodoti.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/63728930389.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/94d8be041fe4053d56d4e14acde8c078/buditipoxere.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/texogixiziguzo.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/22765gjaetr4l6bkbd336pehjv/wikebefakuwizuwojo.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608642a0b941d---34864065980.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021062904143376.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090950e25b16---93573171783.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/d251fd82abfa35276ffaf46ae39d6362/zunigubotufofesefok.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/4501a259467175c4fa449193823fb4c4/kovolizovilomedupogagimeg.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/rejexejusafuvazujogu.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88b0f798fd---jemuluritapimajixikoveke.pdfIn PDF document text
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/nerewefejizizikibif.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/9f5979064e95d86301e06ba131f59430/27227370844.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c885747a2be---44086736309.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076344493452---mefigepawevebolejolif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=profit+is+calculated+by+subtracting+from+revenuesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F1 11240 bytes
SHA-256: bf13bf7ae45abf4ce7f18e687e183eef905aadc3c2e3103d435e4876539fc924
font_01_sfnt_off00010122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11933 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_03_sfnt_off00012f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0F 17336 bytes
SHA-256: f4d1fa96e4a0a5e00d8560cbc98e66b49dea6c627ce869e93fb1674630f791c5