Malicious PDF — malware analysis report

Static analysis result for SHA-256 57bed5d0d47d536d…

MALICIOUS

PDF

87.3 KB Created: 2021-07-26 17:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 978d267aa7c02bc49b842c7f443235d0 SHA-1: 1950f7225a8eedcac8cabd7fe7416ec4b3b32861 SHA-256: 57bed5d0d47d536d5ca8396ebe966f31bf4f57e622c7af081a303bc7b09ca159
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. Heuristics identified it as a link farm containing numerous URLs hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution attempt. No scripts were extracted, and the document body was unreadable, but the presence of multiple external links points to a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://modellszerviz.hu/userfiles/file/83963163116.pdf In PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/c23588mll6qr47vb48chgboe63/12094889075.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/62957335501.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c792f37e2---mibudaxutebabaxekot.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/7ae98fa85837067c5fbbb50d363855b7/mamurivuxakivex.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607eff1b8475d---tinojiwu.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/48fa6e965eff49e0b15f94e36a082aaa/60783020367.pdfIn PDF document text
    • http://darstin.com/userfiles/files/foxalipimafo.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/motijakega.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/09ae0353bb8f9085575eccf30d002185/fedejar.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a77273684bc---821892162.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/zabitabi.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082c6f2acff9---30420295273.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/moiaovhld7ev8pl11rio14lukp/28090844679.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/879247284f84d4de95781e7feb5eae68/31735129355.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082b575d846b---14615024950.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/90015655681.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/74426015337.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5ccd10fe5---62732850991.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/60031481183.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/be0a6fa3200d3eaa1d36ff8224996e6e/vexab.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/5ce5f7637c2f0a9afb153cb5dd25db1b/todutamiwemugabovivupix.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/4303a0c7e5162852f83c60351b6fdb98/gudipevipunawebitev.pdfIn PDF document text
    • http://valaptop.com/ImagesVA/file/nubisibugebemetifiteven.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=what+are+the+steps+to+apply+passport+onlinePDF 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_off0000f13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13D 16836 bytes
SHA-256: 912344782e1c6961ce0d29bc8b306d87362c3ac008233e684310d365139ba416
font_01_sfnt_off00011d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D33 10456 bytes
SHA-256: e04c0bc93cafd53d9a74959ae6ead73d7d6698560ca22df58ab72849525a9218
font_02_sfnt_off000134eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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