Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e19f9bb5bd4f608…

MALICIOUS

PDF

85.1 KB Created: 2021-09-06 05:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1d358ca4883a307b1001d554d853dd69 SHA-1: 5b747207f577e8216ab9ce044fad3a1762c5455b SHA-256: 7e19f9bb5bd4f60847d819ae14270d96ca99c64167d27e80b69c4fc9bf69b637
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The document body is heavily obfuscated, preventing analysis of its specific content, but the heuristic findings strongly indicate a malicious intent to lead users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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=reinforcement+learning+an+introduction+1998+pdf PDF link annotation
    • https://rendiamovisibiliglinvisibili.org/file/dexuzafe.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/3632f3c30c28e53ac8542ab3ea81fafb/29722906744.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/supuwipavetave.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/59665539436.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f6e46a801---denimepojuvalusajeruvex.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160f146620fb4a---xulewubikuvewuki.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202162684326792.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-6/20210506234543731063.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/284c016f1435aafcbf893386a8b290fe/fopizizopuzexosa.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/7e44683482ce70876572c56e47f81d65/lufavokixagovexazas.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/87890998424.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/41311938886.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bb61528d8bd---zilufimove.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607623f96bbcc---70665222725.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/fka4d2uksu6j0o1ddslgtbp7i1/gemobatiridufetaluj.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/79196126561.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021071606584826.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87a7074c48---15661144765.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/3d07dde90337da0cc08881f35b50813f/lenoxuvizilup.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b51833b202---ziwofofeguvalotejovo.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/5g6kphj70qj5p202mtb3ioc6r7/maxugujididu.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/62925337880.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/vovdp814hd9tp879731tp5hi2v/38525024087.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/5c51315f99335e78c4028f44a903820a/21744500384.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/23803726996.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/larililozaroxabovarudog.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_off0000e595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE595 17656 bytes
SHA-256: 0bc53fa2ef4ad83d97f53c063e577cd0c7dba017676c0ccc4a1b948ff31edc38
font_01_sfnt_off00011374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11374 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8B 11368 bytes
SHA-256: 7743dfe62b79640f6cc2e16a22ed4afd6cf0d6c09530af32133905ff2dcacc3b

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