Malicious PDF — malware analysis report

Static analysis result for SHA-256 a082c17ae05c4d59…

MALICIOUS

PDF

76.4 KB Created: 2021-09-10 13:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bcab722cb12be48251dc2977be3ae3da SHA-1: f78d633a069f3bd369940dbfe1b9abc29ebb303f SHA-256: a082c17ae05c4d591654530214d677fccf5c8270438b41c4dfcff2c470259d28
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and an ML classifier, with ClamAV also detecting it as a phishing trojan. It contains numerous links to compromised websites and disposable hosting, indicating a likely phishing or malware distribution scheme. The PDF structure itself is heavily obfuscated and contains no readable document body, suggesting its primary purpose is to redirect users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://libertyquad72.fr/userfiles/file/4707456835.pdf In PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b9a924891---59169013123.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/72287116337.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/87723140242.pdfIn PDF document text
    • https://eniedu.com/data/file/20210904101117.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/suxesegarinive.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/30093628895.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/wejix.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/76727978148.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137559498a37---bitumefuped.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/dididowekoditosodaj.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/37331083871.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395c272d351---fatarodosejutaxes.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/34786284322.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b8a0b7658---54200342583.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/wupemagapasarademelidaza.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a912012ad7---28966878518.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/76712735740.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/27584926407.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/xesoxoruxadupuxiremeke.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/70159035472.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/46269203565.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/52225073616.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613195930c6be---ginazusoteguwamikan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=monday+gif+funnyPDF 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_off0000c716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC716 10192 bytes
SHA-256: 39e127eb642de0c17211a6a5ff41f8f4351f487f56eb213b3eee002957d8e9eb
font_01_sfnt_off0000ddd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E5 17704 bytes
SHA-256: b20ce05cb05999974f8bceaaa68bb9599132f4bbd80b97cdde6eb5241fbb702f

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