Malicious PDF — malware analysis report

Static analysis result for SHA-256 f168a1d3464d6210…

MALICIOUS

PDF

84.1 KB Created: 2021-06-26 00:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0879ed7f9374250ddc6feb9f5c853c24 SHA-1: 3c89f83c3e3c3400504142aea564f3363f2015ac SHA-256: f168a1d3464d62106b1e93830df54dea0707781f56992a54dae98723efcd3261
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of these links and the overall detection indicate a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=what+does+1+cc+mean
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/0cbc3f18cd2ece436d77c6fe712f18fa/78798435655.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071933081778---87018388983.pdf
    • https://singlespeed-switzerland.ch/userfiles/files/16270867267.pdf
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/baramidobugurirerinosum.pdf
    • http://biondiairsystem.it/userfiles/files/bulawug.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160965ec425c1b---54459037467.pdf
    • https://standardpromotion.com/images/upload/userfiles/files/73384376134.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9201099f6---vegovagerarinolepuzo.pdf
    • http://goref.ru/files/file/senozibopexizejoxam.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/0e06c53beebe0562ae59487478286616/10541417917.pdf
    • http://okwecare.com/usr/userfiles/files/24188182025.pdf
    • http://matsonconstruction.net/userfiles/file/85915111271.pdf
    • http://airconbank.com/upload/fckeditor/file/80409955370.pdf
    • https://associazionedynamica.it/uploads/file/fexinewimozufepo.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d23224e42---7912842568.pdf
    • https://ises.ca/phpsites/vertical_living/uploads/file/xumelodu.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609f82ad6fada---xerezadire.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0c4161538458e5d9e892e294bb7a5e82/96729815347.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/3nck16fbr50pncdo0orjsnnm86/nomuxisexuv.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/97386dbf27ab081afe771f3c07c9f3da/rubozogomukejamogob.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c1ff70339---nidavobalaja.pdf
    • http://ambvetfanini.eu/userfiles/files/vugelitaxolez.pdf
    • https://arerp.kr/data/file///pisanejilojozulonid.pdf
    • https://propactionvehiclesuk.tv/userfiles/files/613271668.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/adf7cad83de8257dc69383bebe4b23f2/7066783498.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6c6.bin
5af2bb33d2863112d93aa3c08133096942ee0bc8960d62525176751319b26d5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C6 17140 bytes
font_01_sfnt_off000113b0.bin
77d316d944efc7a34319b5400fc71d049d6516a73058b692d8f517d387a31813
pdf-font-stream PDF embedded font (sfnt) at offset 0x113B0 10444 bytes
font_02_sfnt_off00012b4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4B 16792 bytes