Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3f8582edd3c6a7…

MALICIOUS

PDF

76.7 KB Created: 2021-09-30 16:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 50bfe43bbfb2b1ae802b6d3e397e57d8 SHA-1: 7b98579ddbefa32a459e479a0fa51ef490e2c92b SHA-256: dc3f8582edd3c6a7e0a86787f9449b53a8038efaeb938d7bfab6135e7cfa2468
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141e0ee4a3bd---mututitezafafurapuranixul.pdf In PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614448cfbcf9d---lojigabeviwuputovob.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/88127473051.pdfIn PDF document text
    • https://ambalatender.com/upload/files/96124683754.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/cnbkjnt5lhue37637uspm0l8pf/vagafur.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/bizisoz.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///kudubukeketuri.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/sifetokafoxaxukewaforub.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/wuzipipugedutulinivesata.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/zizipefax.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/3125201374.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/podujogumudemawixigi.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/zijakekodurigol.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/19541141076.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/89879246056.pdfIn PDF document text
    • http://www.immo-uno.com/ckfinder/userfiles/files/94384381980.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ch7jqnf51jpn5kn8qbqraee627/suravelizegewivetoj.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/62403961506.pdfIn PDF document text
    • https://heureka-cz.eu/files/sobuwapuxugeru.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/jegixunizulogubogujufike.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/92024656804.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/80f62736b8a256ec354896cb47b9168e/90593967452.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613449ca1cbb3---86839312038.pdfIn PDF document text
    • http://royalgroup.at/tmp/15299810648.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/19709109308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=pirater+un+compte+facebook+avec+androidPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0D 18740 bytes
SHA-256: f5e05b44b6acaf0fd55698fdea20ab1044d6ed1e1c7f387bf9ec2487c523ba8c
font_02_sfnt_off00010bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC4 10964 bytes
SHA-256: 7acbdf170609bca19d0ba72c1ce954fb8cbbe10890db3130cb364bf8f5427500

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