Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5cc37e981af9047…

MALICIOUS

PDF

90.1 KB Created: 2021-06-26 21:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66aafc076a3bf3c29f0ce086f0272a80 SHA-1: d3b9cd21c81a20c93b564281771ced4ccf27d504 SHA-256: f5cc37e981af90477441e2076c6e65cfb8c0721885922b63fcb07c235844bba2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://cructi.ru/uplcv?utm_term=the+love+of+hypnosis+dramacool
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/irosc1vtfbcnmpt9r4gabne51g/22476144467.pdf
    • https://2acontractor.it/images/file/livasipudezofus.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a05aa4d0ab---dabomesolesetavu.pdf
    • http://didopack.com/files/81071334329.pdf
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/setugabovelavebibasadeva.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f51b1914cc---82767620254.pdf
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/43967624753.pdf
    • https://vannordenvastgoed.nl/userfiles/file/54012089461.pdf
    • http://datavincity.com/uploads/ckfinder/files/wuzowajojawudirig.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a998d0301---zikikarititopuv.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/387cn9760r3sr7ejvo0k9ge9gq/80986954997.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/d8r57tguq2mnqn0jfviqe3u676/98596023074.pdf
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/vubudenedopivupoleseve.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a77f0a8cf92---79332947744.pdf
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/57496285658.pdf
    • https://peilimineko.com/userfiles/file/21451656180.pdf
    • https://ahreco.com/uploads/news_file/49586560870.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8c259f780b6b9267eda913cec5ba5592/75781614102.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16098aa253bc5b---34688643085.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/296bbdeb91e9018ceb8d9503c71bc2ee/wedefojinumuzuwosonexev.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c0812276104---mukujevibiravob.pdf
    • https://sabagdasarov.ru/upload/file/60133232885.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/a65f05a02c29434763f244eb0786babb/tilufixumuwulofose.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160843365e911a---riduragogusiki.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/25591783494.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160990bc1b17bb---65218018392.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb11.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB11 16792 bytes
font_01_sfnt_off00010323.bin
24b6bbd48fce0eadb16eeba85d3e34e4602ed3cba7658babf926d58c766f78f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10323 18168 bytes
font_02_sfnt_off00013215.bin
833deaf5e8add877df069c228ef82ad4fb3cb27866e7339dfc5ae40ac07d54c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x13215 3996 bytes
font_03_sfnt_off0001414b.bin
b279ef3833ab5698a4beb2702ad827bdc99b3b2da10b398b8fcde06733811879
pdf-font-stream PDF embedded font (sfnt) at offset 0x1414B 10928 bytes