Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f868849839ca07…

MALICIOUS

PDF

86.5 KB Created: 2021-06-29 02:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc5f4381c5ccb14b0e448dd0266c3a99 SHA-1: 8a4961ef46933661fccf7f1748ad748cefd2fdba SHA-256: a3f868849839ca079a63d7ae77e21fb6857a67abfacc6666220212f60aa0a7cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content. The presence of numerous URLs hosted on various domains, many of which are associated with formcraft plugin vulnerabilities, indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b31126404---tizoruzebibigitep.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b78bd6506---90875236970.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/5e4b4dea1e131c4e37d8be906a6e1431/60865114277.pdf
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/14705591105.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607742755073f---70952307528.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c68dca971df---14565087456.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c79d3f282---36697558450.pdf
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/beloz.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/gufazibik.pdf
    • https://landbar.com/upload/files/jamofep.pdf
    • https://fanaf.comarticle_ressources/file/mesiwitokijuwizelanur.pdf
    • http://coinmarketsuite.com/ckfinder/userfiles/files/86973754470.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d97e4f483---22446183571.pdf
    • http://dansecyr.ca/pdf/file/mavupejitin.pdf
    • https://laughteronlineuniversity.com/images/upload/files/51064870666.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077673d4c502---xulezasilepowobobimi.pdf
    • http://minuspk.ru/minuspk.ru/userfiles/file/39329180403.pdf
    • https://mollis.rs//files/gokam.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac606905a95---64501296655.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160a0676182dad---59360733515.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4ee631fb4---ludakuxinupuxolosazi.pdf
    • http://phrabat.net/UserFiles/File/93714102722.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3501f2bae---sabilabamimep.pdf
    • http://euro-ex.com/images/blog//file/3816615142.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/e0aa5a4f8a500a7feebddc5e4aa3c3ec/85220747449.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=orchid+is+turning+yellow
    • 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_off0000f0bb.bin
faa70b0359dbfa64dff69188c758fce0b313ef30ec4a8f5d2c5db5402516f832
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BB 16716 bytes
font_01_sfnt_off00011c34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C34 16792 bytes
font_02_sfnt_off0001344b.bin
063811e09516c1091d6778806c2c5616b747fb6e5e24ae558438d3cd408a839a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1344B 10812 bytes