Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ddd8ec40c991f2…

MALICIOUS

PDF

70.6 KB Created: 2021-10-03 03:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b32337e3e90b1e029827a1ea72211b9f SHA-1: 8f21439f0b28cc7eb1072fd3be0f2da87b6030bb SHA-256: 84ddd8ec40c991f2e0a5744dbf973105ce43b1346848817c6f90cf4b7e31d1ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users. The presence of these links and the PDF structure strongly indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://agcslohian.com/userfiles/file/kewevezixilajonojel.pdf In PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/8095f0e7f9fb7d896523db354e16712c/21444783326.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/53874041829.pdfIn PDF document text
    • http://esangsok.com/upfile/files/daxuj.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/benide.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/97962032811.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/duvufuwixunuvoti.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161492ee7c3dee---27918789034.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/suripetufe.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/43fies84v3pf7768a7du0m7jeo/10905172443.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/26253866631.pdfIn PDF document text
    • http://robbymakka.com/userfiles/file/lafiterisi.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/53878781450.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/p5okummns5ev53sk6nbp5ae8pt/fumototikalagaror.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/disotuxibisujoxoxejuzam.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/mifona.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/31135107831.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1609a68a8---24522952366.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/142228709161467ce65edd5.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614de9e217fae---97573525564.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/32781976194.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/6817511436.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/tujisena.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/64762635179.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/27377905870.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/34971359099.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=argumentative+essay+about+online+shoppingPDF 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_off0000b4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E2 11100 bytes
SHA-256: 37d6bc9e06e3fdd0da64a4d8341ccf422714926432b53bd289597d70c600ab0b
font_01_sfnt_off0000ce6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67C 14940 bytes
SHA-256: f927dfefc60c7b7f7e969d262c41b510b0a7812352b317ebedda8a3ad60d8b8b