Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7de131343a207fe…

MALICIOUS

PDF

79.3 KB Created: 2021-09-01 02:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5e72bcbbf2b6d6e594124e78bd36c78c SHA-1: 935cf8303f93c273fee04aefd62a3ad94490e053 SHA-256: c7de131343a207feeb91905a62b8804386e385487c1cb39aef87295d8e8e899e
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous external URLs, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and URL patterns are consistent with a malicious PDF designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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://logiccpacma.com/ckfinder/userfiles/files/70523380938.pdf In PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/tofarogewebejatokofukol.pdfIn PDF document text
    • http://hghs61.com/clients/9/98/9814c5f28b4e93efd1f74733a9fd6b0f/File/45825318956.pdfIn PDF document text
    • https://menu2uplus.com/images/file/mufejanitakasokawowutigoj.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/3a336453073adb0caf6ff05c9243df10/86729482682.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/kiwopofege.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/sirawudepoxido.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2de5c21b0c07f740220cc25911096c2b/labeviwikejuwimu.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160885ebf929c0---jukilukuwopepodalubokab.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c409dccdb---26325618593.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/dirajet.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a9cb1baf0---kakeba.pdfIn PDF document text
    • https://baglab.pl/galeria/file/nerodewufasifaxudo.pdfIn PDF document text
    • http://yljx.cn/images/upload/File/39728332908.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/43443272434.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/42638110168.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/12489838915.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/66489311592.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ilcjnsah37utfdsr95qhe45217/desivalujutizuba.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1b2021a8f---10035231737.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160beabc052cf6---56438232534.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/botaviwu.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/lexupodixovapomofufivetu.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/soremexipapotolodijaduv.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/6lclfrluk66irgm7kfbr2dsvb7/89989432368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=evanescence+in+the+shadowsPDF 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_off0000d252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA69 10456 bytes
SHA-256: a8f2d445406ad488e7082c643c94064d2e551cbb174f88f4b76a94e10bbb645d
font_02_sfnt_off0001022b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022B 17356 bytes
SHA-256: 0ebc7c900e81a51a689a117fbb188a60643f2430131864dc551ee8de87b66702

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