Malicious PDF — malware analysis report

Static analysis result for SHA-256 edda0e6b50db0955…

MALICIOUS

PDF

84.4 KB Created: 2021-09-04 08:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 409768c6e583e6f3365daa54463aab89 SHA-1: fee59d4ec9d5556c664032766480d6188e57677d SHA-256: edda0e6b50db0955ca8c4ba61ca94d61fcbc309849e9624e3831bc46479f17f6
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crewmak.ru/uplcv?utm_term=types+of+piston+rings+and+their+function+pdf PDF link annotation
    • https://jagamimpi.org/contents/files/90248395522.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/jisopofito.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070f81f24d46---69362619212.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/70786313004.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e884bfa16d11e59e99df714aa2e7bad9/14680058072.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/64043567325.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3c455851a---28290039201.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/sexutetesadufimoluj.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082d5a81c526---legufofijox.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/18294900928.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/6620392df78c493588a0676cb9ce4fcb/tofufilowugiwekafuf.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/vm7ociipia1sah01ihgn0khop7/45904194527.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/lifugewekeperudise.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bfebca3a8c0---zodulidepozixoradavopo.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/gejusinisenimep.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/43240223556.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0e7ecc2ca---wumese.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/18661224874.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/pejoxonobo.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/wafumowum.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e704a602689---1447614555.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/5157952267.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/56262564547.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_off0000e392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA4 17848 bytes
SHA-256: 72d8b380471d9c617cc135a886c3b3a915861ed19f34253f1cf791a0a0fa09da
font_02_sfnt_off000129f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F7 11028 bytes
SHA-256: d04804c7ba1ea099f89ebc02dce2f0bf0f94c62ffe179ac22f538b49f3f8ffa3

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