Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f44b23b19260b1…

MALICIOUS

PDF

92.9 KB Created: 2021-08-08 15:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2262fbac9d22ecb2b0655b9f48580ce1 SHA-1: 0709af26afb87d4f8ed42e66e9db01a40c33b056 SHA-256: 82f44b23b19260b16e21ae9fd14889514536ed62b49bd5f44c5620926a971301
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains. The embedded content, though heavily obfuscated, suggests it is designed to redirect users to these malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://doanekeyes.com/userfiles/docs/37437976504.pdf In PDF document text
    • http://otoozevran.com/resimler/files/14065229004.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/momusu.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/maguranoguvil.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/48268915455.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/kikurigozazef.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/majoz.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2d535b0e0---jopalurixexexoxilonawi.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f49e7f34b---nofawuzujonamumenab.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/29478ae24a3748ab9da5c201298ea82c/dafelefam.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b7ef55b17---duzesuvufexisogizifimuka.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/59395242637.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/d89a5c0aa303a61516705c779531ef1f/najogalarulivopawuzat.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/584466c503213d4742de4514cf264cd9/xalejojozabu.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/durubotupozapobakotexiwa.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/49983323592.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/4339347695.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/35314969826.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a33372258e---vunatazid.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210713_094320.pdfIn PDF document text
    • http://dichvuketoansg.com/luutru/files/xamazofanabewozekez.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/mewetogabexapalirik.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/44bd66f20eca76522fd2689b4e71457a/numuzirugotoxulexulunag.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/37000613058.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ac05ac3ccc3---37789793869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=cuando+se+escribio+la+alegoria+de+la+cavernaPDF 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_off0001019c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B3 10784 bytes
SHA-256: 4de1f53328f72ba7405a255ad632caf5e667f6b6f21772cd1ec6a189a0161e72
font_02_sfnt_off0001326a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326A 19916 bytes
SHA-256: 4502d3e9e4aae2a76537bb64731fc31f4efcf99287d8426ab4d3dac03b75ef85