Malicious PDF — malware analysis report

Static analysis result for SHA-256 a787aa28ebb73591…

MALICIOUS

PDF

67.8 KB Created: 2021-09-05 16:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dccddf4218fbc15c99ec9792cbc3341a SHA-1: fb346b74e44c025b36eae75f069e6f0b37296c10 SHA-256: a787aa28ebb7359131b8bef6910c7b810d7a9d90044742bc900ea3ed41dc4765
164 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly suggests a phishing or trojan distribution intent. The presence of multiple links on potentially compromised or disposable hosting indicates a tactic to evade detection and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4753

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16078b39797f7c---73066278717.pdf In PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/4e9e486c1c0d67eb0b0f965804ee029c/bojor.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124a58a3a30f---81969367432.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/d5e4385a38d06a495441c6aa717e6308/gimarole.pdfIn PDF document text
    • http://sakra.sk/storage/file/32786917573.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/96128762907.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-8-12/20210812170838376820.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/xizasil.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/fesap.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/fimenaguxukaramifo.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/5ba9add724e1d46f803bdaf4c694ba9c/97117772579.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/47580056542.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/79590872618.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/rorobotamixewugifudas.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/sawebowadidefem.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b17c539acda---bujesu.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909633c079d---rukobupi.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/91431342880.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/26f4b397de859e498c6cc66ef47d19ff/mozezefusogudidivep.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/a2c26829c624b83607baf9d6313192d3/fiput.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/24957896048.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/38849783230.pdfIn PDF document text
    • http://beta-rc.com/upload/files/40919699100.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102fe9ab35e5---poxadaseluwuwinazonigojil.pdfIn PDF document text
    • http://araonline.hu/uploads/file/vuxukopafozed.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/e645f8707c213834ad6edf2d6db6dc19/zoruwaxerutat.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610af85a03b3e---81378487297.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/cc4f79da4175f073fd61a6ab426442ca/50266388331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=story+book+pdf+free+download+sitesPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAC 10996 bytes
SHA-256: 9e2919e275f0038aa5aec0ac22e33bbb0d733fbbcf07d5aed01afbeeb4c72179
font_01_sfnt_off0000f938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF938 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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