Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12c251c383bf423…

MALICIOUS

PDF

84.8 KB Created: 2021-09-20 06:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fc497be8f176fa8e1946b8222ca0af55 SHA-1: cdb295270aca922264455de1d49c7a6f5842a694 SHA-256: c12c251c383bf4237b8bd0bfb916179fdf2d4c5915cefed71a92cec7a1c3c0c8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external domains, many of which are hosted on compromised CMS upload directories or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure itself does not contain readable content, but the presence of external links and the overall detection profile strongly suggest it's a lure document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://betonkeritesek.eu/Content/files/25964064786.pdf In PDF document text
    • https://latework.cz/soubory/gowiguwinuzofewoji.pdfIn PDF document text
    • http://santabruna.cl/upload/file/sugitadosugoxobozuloj.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/rokofipalazoduw.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/93267494709.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/8e396ba6f5dd14a4bffaf6eee4b604eb/89629687272.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/92794158192.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/beboxipiratowutifilekasi.pdfIn PDF document text
    • https://iohrp.org/f_files/files/10917421300.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/039e52881a2f3d91df52aa9557c64898/jobefitojuxopadafe.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/lg526lku6vf4th43ra9veeju34/37314623483.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/74076715747.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/duzimorug.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/15274788149.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/mazujupositujabemuxikufu.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/81382f29bba89523fdf2382d1f811448/84273744679.pdfIn PDF document text
    • https://mcsfood.com/images/file/35505836855.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/jeleditosokaziguf.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/e9d799e9c0dc92a3533717d79a5a81f5/xaboxe.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/36492379826.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf443d26f2---30147146294.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/rumema.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/nulokunebabakuwabuze.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/31946782932.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/69733041642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=scrum+guide+2020+download+pdfPDF 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_off0000de6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6C 19952 bytes
SHA-256: 53b1e3608ce918bc5259606e85b9f845d6e7022f7f86a4e6f932b8b2d4a2a4ba
font_01_sfnt_off00011313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2A 11200 bytes
SHA-256: 77007f7707ff4fd06bea07452a9270b255ec1b9c96d87d579ba5f0992cd01447

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