Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f04c282109160c…

MALICIOUS

PDF

83.0 KB Created: 2021-09-07 12:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f0753116a5320fdfcda1286cda9633ec SHA-1: 50249b94f26a8f888eea97e94efc6031ab891c82 SHA-256: f8f04c282109160c4cca192251bab19693c3dbf4f25434d26de114a27bc40b4d
158 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating it likely serves as a phishing lure or a distribution point for malware. The document contains a link farm pointing to various websites, several of which appear to be hosted on compromised CMS platforms, increasing the risk of users being directed to malicious content. No scripts were extracted, but the presence of numerous external links suggests an intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser exited -15. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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 http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16134d083b1cfb---14402055983.pdf In PDF document text
    • http://bachova-terapia.sk/images/file/2549916466.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/fupilerisegib.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/davobeg.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/suzakirus.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/94250140637.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/47282322383.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/bumatawo.pdfIn PDF document text
    • http://lamay.de/userfiles/file/porakiwofipazoref.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160efdb67d982e---denif.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/43487894951.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16074b96587a58---24399405315.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/81320684150.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/pibeniwatos.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/rafajorerojoferofukaze.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/d450ecae7dc79f32773561c6011fec84/16844515296.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/99111373984.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/75332323914.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/9365129514.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/resamewuzafonubulezajof.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc62091455---71021303284.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608348198f0b0---wofetumilesovawudi.pdfIn PDF document text
    • http://agriturismofattorialucciano.com/ckfinder/userfiles/files/lujoduvaxilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=buku+belajar+coding+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1F 11044 bytes
SHA-256: db96b0ffca6898d18011de8e820568a3b342e457dbad5d949a07db49b2eceb2c
font_01_sfnt_off0000f879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF879 17676 bytes
SHA-256: 9f6765725107e162aa6fdbf8d6193695a6eab42262507cd136b9eff2b0e13af5
font_02_sfnt_off0001268a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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