Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c7753b398f2ab4…

MALICIOUS

PDF

94.5 KB Created: 2021-09-01 02:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac58944e2e9ff7223dca3d52d2cbfb25 SHA-1: e9334d51c5f1a7331252080141fa41be3b288b11 SHA-256: 09c7753b398f2ab473213b99c4f89953fa8bee37f0610490581990c7b67f1cff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing and potential trojan payload. It contains numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are consistent with a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=english+learning+materials+pdf PDF link annotation
    • http://al-bandak.com/userfiles/file/pinudifavikopemifovud.pdfIn PDF document text
    • http://195exim.com/datas/files/26903232243.pdfIn PDF document text
    • http://susutour.com/userfile/file/kimosebiso.pdfIn PDF document text
    • https://tekmaker.com/upload/files/redutuvitesixomofewijelop.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/bolezixexegorovu.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/xuneturatasidewixemuw.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/47680782c9183bbd9f2456d21bc1b7d6/83831287609.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/7a9f719f1595b2a0d5e4dcff5d707805/zidoporuwigezidudaxisuni.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/68854509301.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/92552249765.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/zumebitaviniz.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd987ed464---43269905098.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7501dcdd5---58065003970.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109043f7ccc0---74984220446.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/18882515326.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823c48e4c96---99877234990.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/40436406453.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/rarififo.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/kumisigolasekoxozadejonum.pdfIn PDF document text
    • https://airbays.com/userfiles/file/bawuxosironapirus.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/6569522071.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/1mp3omsr1qfluj1t22koa9otum/nuzubunimosanagep.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/lewabefaroburejid.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/ribemomadu.pdfIn PDF document text
    • http://mousike.it/img_ins/files/51110318915.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/22774156546.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_off000109e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F4 19060 bytes
SHA-256: 85908a0be3eeef75503f8bc897cc89b4514d1d093b43471dbfe8626dbeb15fef
font_02_sfnt_off00015346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15346 10808 bytes
SHA-256: ca211da68a4f24107d1eed2b5dd1db6b210c2264633c734e1e2f35e9497c924d

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