Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c77ddb4e5e68314…

MALICIOUS

PDF

117.7 KB Created: 2021-09-07 03:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aeeb9860057c96fcdb79006a6dc660f9 SHA-1: 6f67c1da266d528130b4d33687636afb6d406de6 SHA-256: 6c77ddb4e5e683145b52a137a8c03032ef392cf63138ba6f603e85aeacbff902
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting sites. The primary purpose appears to be directing users to malicious content through a series of indirect links, potentially for phishing or SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://thegioibaobicarton.com/Images_upload/files/rolodubidikajiwebif.pdf In PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf6a2af09c---milexewapiragekusaxubi.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/81720463001.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/57885929175.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8bb446327---wonizefimukixobovato.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/682bcd32b36749cd26fd58a527dfeb63/30051449892.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210806215438_zs2cg5.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/83617443285.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/17462638653.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/c9bd3081591e7b7a4e4fb01ed98c73f8/96887986263.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/66130235245.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/77127069787.pdfIn PDF document text
    • http://614move.com/clients/4890/File/bidaduxekigirudivimokaliw.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/kipobapig.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/5692561667e0397d24ccf0aed04649e0/xabaruradikotodekujo.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/kivitodubenoliruwuz.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16083e43e93b25---5007897052.pdfIn PDF document text
    • https://arerp.kr/data/file///dosafun.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/0fb07eea5f5099d58afcc527a62fd189/gupipigu.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210620011008.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/ed72229cbe47b6abef236845eaa5c71b/56332824551.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/e510heb0tat1m44qfk9v123f3r/53246633114.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/leferedejurewometebiwaliz.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099788a28aa9---tewutovudodo.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/ejid3vv824fb3jthuhau2onkni/finubozewita.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/nujuniroriv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=worksheet+tabs+in+excel+missingPDF 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_off0001644d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1644D 19488 bytes
SHA-256: 8c2969ea9843f0b03b5f02c4b844a82ac937597f6c7e07c5776c4eb3732eee22
font_01_sfnt_off0001977c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1977C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001af93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF93 11004 bytes
SHA-256: 0a53b98d169d329941a297280d4d1705df79a94a1056d8e003976556132fe7fd

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