Malicious PDF — malware analysis report

Static analysis result for SHA-256 754916569a33b600…

MALICIOUS

PDF

79.9 KB Created: 2021-10-17 21:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 338c44eb0743ce25587d3f77cd6ca3a0 SHA-1: 70c6073ce8adc8b9167e71cd882cc40af1cddd3b SHA-256: 754916569a33b600603756079f0793760d3af8d52d1cf601f106fbc431f57d7e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple domains, some of which appear to be compromised WordPress installations or hosted on disposable domains. The presence of these links suggests the document is designed to redirect users to potentially malicious websites, possibly for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://digireg.li/upload/45252888491.pdf In PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16158f069de260---bodivedujuzexipubibofiso.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/fusunefetijelabori.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-25/20210925055255818674.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/rovuzokesum.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/66782218209.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/gokunadimerogegiruf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b93e704838---lagagigetulufe.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/matuweriwu.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/46232093556.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/welifipaw.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/jerojokabakexemuwikoronod.pdfIn PDF document text
    • https://oasis-travel.ro/files/50490329574.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/8995311170.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/jukexofupijikudare.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16162e0ea01862---xiwogopovojek.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/vitikozinurifisijagi.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/8adaf07a028d3f55240592712ee6cfd7/58928638911.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336e2e28ad7---judojivi.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/17810369189.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/96269926368.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/oscUj7J0Gjw/uplcv?utm_term=play+minecraft+education+editionPDF 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_off0000d4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C5 17604 bytes
SHA-256: 87600f03f6b923abf9eb5a7b1c3ab62210fae546dc37804920314d798bae5e60
font_01_sfnt_off000101c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DC 10684 bytes
SHA-256: 9c9ef785cc4e48b0328cc09c464e44f2d5adfd68e87ca273279973eef6034b5f