Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f0d169899ac647…

MALICIOUS

PDF

89.1 KB Created: 2021-09-02 07:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 914cf9007bf29fe4dd98ba82ef20fb9b SHA-1: fd7fca6ad680356a8e2c2597b59127c37bd2e85c SHA-256: 61f0d169899ac647f8493bcc5c9c86476384936e09e593e71788853773866865
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 Pdf.Phishing.Trojan. The file contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the nature of the detected threat indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87f34815f3---72037694506.pdf In PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/0mj046j045alq4c38o9unl3lfq/18446421618.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/78264627691.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/24090488310.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/8adc442b280b135b60cf23b089aafe20/tojesotozatomometozunawu.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/f28337f3ba543a673eb414645f09af28/24441225515.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/d826031b351bd28655727aabfb40b637/79703177131.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/wojiparazajivotabodeb.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/tifodof.pdfIn PDF document text
    • https://alutat.com/data/file/sanuterur.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/13016889059.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a538ad15fc1---24431032385.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1e32bcc85---88542411801.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607eef3e10f70---xadepisazazinavuku.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16085d8d981faf---mofumotolenajuwafaxevidar.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0948d5f63f---govajosipuwib.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/9f2c972e7f4de943e1652957bd3ba062/luwajajanase.pdfIn PDF document text
    • https://dannysacademy.com/ckfinder/userfiles/files/filugedivoridip.pdfIn PDF document text
    • http://shavers-boles.com/clients/7/73/73b1ad2e2c85410b7b015c0c79a6caf4/File/virepuvaxuta.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/guvijatofukudigu.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160984b5d9f25a---zokareb.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a97fb341c5---tariburaxisisakavijopumo.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852a8c721c2---2498715675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=sonic+the+hedgehog+and+amyPDF 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_off0000f787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF787 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9E 10692 bytes
SHA-256: 07fd587619cb48d2518a7e54a1825deb19c2ebebae7dc58919c650d9d358cce4
font_02_sfnt_off000127c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C7 17980 bytes
SHA-256: 5deb558d050203162c7cd026371586353f3e2493cb198cd778e84743f1b2e8bc