Malicious PDF — malware analysis report

Static analysis result for SHA-256 13298642779eafda…

MALICIOUS

PDF

88.8 KB Created: 2021-07-03 00:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4f95d0384662b38d582df163d5c02db4 SHA-1: dcce758ae96fa933f3672c1014f347bdfdaa3efb SHA-256: 13298642779eafda7e99ecc299c618e08af6d62d75fe37315e40639144375b39
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, directing users to multiple compromised WordPress sites and other domains hosting PDF files. The presence of numerous links on disposable hosting and compromised CMS uploads suggests an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/4bfngjgk611loukodtrrmdi5en/butitajepasumo.pdf In PDF document text
    • http://hesexpo.com/img/editor/image/file/33593608553.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/mtbj8eftfjt6m5feb2sjokvfl5/41822829852.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/a817844cede2bf4151d763638aa832f9/pujogovudadifavare.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/9jonrdb2kaibk53t718comujgd/vazebezudojuserob.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/86230575690.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c8faf49c7fe---pipaxiliramutejafukagako.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/90427232464.pdfIn PDF document text
    • http://honda-vo.com/upload/file/81283791274.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/velenudanaxefem.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/2ac3356ac25fbf813c62976f77493982/sijurijigatu.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af58fca791c---legovezupefujidovadiveva.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/32329171510.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/004105728aa7a53b1ae8d5106b79a2dc/lerefewerozivowevelij.pdfIn PDF document text
    • http://merwepizza.com/upload/file/84646469396.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/afa243e678756a4792a9a9ba391c6e38/73291971330.pdfIn PDF document text
    • https://dhcom.vn/userfiles/file/kofasitekudesew.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4d4bc2600---guwad.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaf3361a52---97501062786.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/d3bfeabc33eb5ce86ba3a4f4206e8968/padodozizetamij.pdfIn PDF document text
    • http://mlkscholarshipsmilwaukee.org/clients/f/f0/f021f13c5c598389be7e913a1ae626ff/File/75659952546.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210529013422.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/76c57efd94d1b175d3b11cff0f436b3f/20371112162.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a110ff7dc6a---kamodikirozukomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=metric+weight+tablePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBE 17376 bytes
SHA-256: a1f1245cb94bc518c0d5fc2e91de00f4391d456df1d994648e47974a27e34631
font_02_sfnt_off00012937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12937 16060 bytes
SHA-256: 79f27ef1bf85ca6c198d098614f2f622ee7798d500390a76c2468bf998b64bfe
font_03_sfnt_off00013e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E48 10336 bytes
SHA-256: 3afe0be3bc62b272492b6c83b0703ed5aa799d9a007e380c86c3211fb3c0b43b

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