Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f16b41e43a9e40…

MALICIOUS

PDF

84.1 KB Created: 2021-09-11 00:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c0f68c7cb6bbc4a24116e26a951efaf9 SHA-1: 4aa7cb6f804a16bec41b51850b60c124babdfcf1 SHA-256: 19f16b41e43a9e4079d11ed0246e131437993a6a07cdebe99c180327c779132f
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, specifically identifying it as a phishing trojan. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDF versions of web pages. The presence of numerous embedded URLs, many pointing to potentially compromised or disposable hosting, strongly suggests a link farm designed to redirect users to malicious sites. The 'SE_SECRET_RECOVERY_LURE' heuristic indicates the document's content is designed to trick users into revealing sensitive recovery information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/52443201018.pdf In PDF document text
    • https://haysalon.com/public_html/userfiles/file/rejifidonigeride.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/50918749199.pdfIn PDF document text
    • http://horvathortho.hu/tmp/31034996449.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/kuxodedilav.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/susokejetasolirimebomagon.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/xigafevaboxefapel.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/duvilafo.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/masagimivapinujodap.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/4752678686.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/47060450533.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/15406782157.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/pidujuserozewufaziv.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/2o83s49saggpmm2mg8c2oq8qib/12374801810.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/18830518126.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130322ccf038---vanafezamuzofawove.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/2414216453.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/27526935078.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/54121820260.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/80230864008.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/magediwipowepituwulibik.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a624eeb2a---86662762158.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/vilubomowilakepovojeke.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/10299176666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=photoshop+2020+crack+downloadPDF 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_off0000df98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AA 19492 bytes
SHA-256: a8e0e2d80e64852ce90ed98483ced71ce6520c43c5100c551f4101fcefa7893a
font_02_sfnt_off00012a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1B 10808 bytes
SHA-256: 9163e18f5a19e142753814b7c381ebc52bcbe20aa4b638697e51e4ba4171e501

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