Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8361403ec9b256f…

MALICIOUS

PDF

85.6 KB Created: 2021-06-29 06:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73d20a60af7b38cb805c9b950bfe7dee SHA-1: 5a31df5b846812a67a249c5afa1b468c85eabf03 SHA-256: d8361403ec9b256f8862116584f0346d263ec95a7aaf0aa35374d699daa700d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://suprizpin.com/calisma2/files/uploads/65925603599.pdf
    • https://greenvalleykerala.com/ckfinder/userfiles/files/70714976049.pdf
    • http://www.anclupnapoli.it/userfiles/file/83736713855.pdf
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/zifawaxupikaxajopaxegura.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/51ad6241c2b98b8f71990d38dd73709a/xezojokalabukivozi.pdf
    • https://ctsgroups.asia/images/file/47081174273.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873adf67854---67407458306.pdf
    • http://local-minicab.com/survey/userfiles/files/73991968550.pdf
    • https://tappowine.com/file/kileko.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/6vu23acvfkve1cnn0rv29kjhmv/11745900435.pdf
    • https://caribemed.com/userfiles/file/lorilejusilewobizam.pdf
    • https://datatech-int.com/userfiles/file/84047885867.pdf
    • http://harryreichert.de/uploaded_pics/News/file/65497296958.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b51227545d3---riwaxevadeg.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/mfohcaf6bkpcudmccg87k1di2p/54739856046.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d8c7849a1---paxefu.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cebb2f09e---xitakabivos.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa709c2b24c---61156625436.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/324f2ca77dd2dd4704762263c181b5fd/tulagufuzani.pdf
    • https://banderlogclub.ru/Files/file/ganevejexokemuta.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/rm7972s784hcq679run2tjlfs0/20394408881.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/a68a5820c07007cdbe4016d0d37b51db/28166416028.pdf
    • https://bilegt.mn/userfiles/files/29075270589.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608696f472044---22614202779.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d062c7937e---vavudi.pdf
    • http://www.mysample.com/subdir/
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=htaccess+redirect+to+folder
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e84d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE84D 16792 bytes
font_01_sfnt_off0001005f.bin
e7cda86225b12cbc99fb2d911f037e7071167be4bcb5c6f207f224aee5fd727d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1005F 17972 bytes
font_02_sfnt_off00013018.bin
917b267caf6f27e316278333ea66c5bdd3b77750aed4c4e30bc3be8c6876f4b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x13018 10356 bytes