Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1279192ffbd67a7…

MALICIOUS

PDF

78.2 KB Created: 2021-09-06 10:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 816c73d4435a0b84119e6524e0f8d423 SHA-1: f719c3ff68097ce27f799f375fd901360ab710f9 SHA-256: c1279192ffbd67a78ad963083952966b653a6444351918027b8866d60e73b384
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of UTM parameters in some URLs further supports a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://infrive.ru/uplcv?utm_term=mccloskey+r105+manual PDF link annotation
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160918e8e6d416---majuvagovuzibutemeradi.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/64788016704.pdfIn PDF document text
    • http://yejida.com/userfiles/file/pigarixutotib.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/81229756838.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072003d20ed6---15213887494.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf0750434d7---sobojurewobawipasod.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/60447991444.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/611d912fe7a48a9e3ec685dc3ac8a5e3/11875421978.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/xelewiguxabusek.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/99760049956.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/88249335420.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/14860303859.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/15397c5969410f50d24fd6df0049b4e1.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/g22mg55423ji0jl6s9idc1oecu/voxiwimodi.pdfIn PDF document text
    • https://slotpt2.com/contents/files/wowudowowevewi.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/nalefut.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/kuxoponatosipelowumij.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160906aaab61fe---81522410932.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b1029ccd9---zenezileg.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c400ece5be7---78658929457.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/99125027460.pdfIn PDF document text
    • http://uamarkets.com/images/file/gojabosulalij.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb295880eb---furanebumagamoz.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0a5db1f5a---tofulolop.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/vaxilujapepesuxonato.pdfIn PDF document text
    • https://www.unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/vurebabufolakipesim.pdfIn PDF document text
    • 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_off0000c908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11A 19524 bytes
SHA-256: 8eb1a64a16a5dfd8ca5a53bfc7418a68cb5fd0e3d22ef2c4a3c801f4f0c21e67
font_02_sfnt_off00011292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11292 10808 bytes
SHA-256: 5cdaeab16c053931470c724dec8bf83ed5718c910cf21b56f33305d8072fdfad

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