Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af966621a3ab513…

MALICIOUS

PDF

85.5 KB Created: 2021-09-07 16:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 33b31e546489512848eb2b9912558f8c SHA-1: d4136390c9dfef5c215793f3799b8c0f55f66ece SHA-256: 3af966621a3ab513ef4da84b1e1235ba4a1dee438edf29e6fc0ccbdbda410820
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1510e153b---jilabi.pdf In PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16093b12eb3184---wajuvefokejo.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8df64a491---10749594217.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/32174472280.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/nasetalurakene.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafe9acf24a---bupexidirojufux.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/nufosaxobazubuvitin.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5dd4023c0---29847468034.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/o9g2j12sbvpfejeq46mgnqkvu3/66839283678.pdfIn PDF document text
    • http://446888.top/userfiles/file/72849697365.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/50158358098.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a50ee786c69---gapubusifonevuzo.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/kanufimojep.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c9708ae1805---nobul.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/ldcg140hbnrde023mq4d62fbvk/gamupo.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/68656629670.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efc9b13e47---81950809186.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-7-4/20210704184415403420.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/25492191042.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/27792862375.pdfIn PDF document text
    • http://balone.net/_upload/file///wokukipanel.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c656b85d948---xudapotufunegometek.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/73845865073.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70221061501.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1629293626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=pdf+file+viewer+free+download+for+windows+10PDF 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_off0000e96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96A 10576 bytes
SHA-256: ce16ad55054ccc726369367b908dff2b0e9c9219804142ce96d575bde136bc1b
font_01_sfnt_off000101bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CE 17844 bytes
SHA-256: 6663c156c70cc4163fc9bca1e0cfce38af77de7e690d27948ab792bb8d6c0854