Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd63ccaa4a747fe…

MALICIOUS

PDF

67.8 KB Created: 2021-09-27 00:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c76db0baa1d1e0b897ef92c62c2be733 SHA-1: 5befc87ef54f48b0079216d05279d8de65b1ba8b SHA-256: dfd63ccaa4a747fe6fb6980fed9a368ac97d8a43e71ae4b7d957d6fe129492c3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicative of a link farm. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a malicious document. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://metalltechnik-kutschi.at/foxepawewawes.pdf In PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340333e0fc1---60389662244.pdfIn PDF document text
    • http://yieldpharm.com/upload/files/sasomesikoro.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/terako.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/57412396745.pdfIn PDF document text
    • http://skomi.ru/img/files/file/noxilites.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/tomafojolugegonivana.pdfIn PDF document text
    • http://cx-gl.hu/images/files/tuledibufujosevolubax.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/susiroxusivaxefelu.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/sovamikukefane.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/210907213554918389trzp2.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/32d3780413e2f3af588cea24b42ded65/31400138442.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/sikojasavopo.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/pepuv.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/mamupowujumexox.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/pivemotax.pdfIn PDF document text
    • http://sinners-party.de/media/file/nilevozifinesuzede.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/golewigetizolunut.pdfIn PDF document text
    • http://balalajka.nu/media/55229314605.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/fpdp44g0013ht1p620jfrrvhvm/jorigajubezevu.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613822297d017---xidivitatosowuwot.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/94301468029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=nzqa+chance+and+data+level+1PDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/vepeniwivuj.pdfIn PDF document text
    • 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_off0000ad3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC550 15016 bytes
SHA-256: e267512b4dfe8299f83ba7e89615f896fb8572cc0710fa4ea963cc0e4e2ff5c9
font_02_sfnt_off0000eb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1B 10288 bytes
SHA-256: ebc27910b452c90bc12e072becf5a7d1c738efd71731d919d6b813ed34ab6539

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