Malicious PDF — malware analysis report

Static analysis result for SHA-256 0570ec11a14d91d0…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 04:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a364e783e7a59f664cea75e85621bbf4 SHA-1: a0dfb69c6d9b32c24929e67a8af8f1c70e468242 SHA-256: 0570ec11a14d91d05678a79a0f459e987fe6d5b5f2bc66fedcd3d5a708606eef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final destination. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly imply a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=jodi+sajjan+adeeb PDF link annotation
    • http://szilasfood.hu/pic_upload/files/15284070237.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/birirojo.pdfIn PDF document text
    • https://esz.jp/img/editor/files/43768211209.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/5513c515729a5c4bcb3537960fd3f081/41728751265.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/gujupufuguvisujenofoso.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6df4f4138---momuzizelaxonaveropemazad.pdfIn PDF document text
    • http://electric-kernbichler.at/73566437168.pdfIn PDF document text
    • https://gulamanis.com/contents/files/1207888764.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/14403372536.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/17310600229.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/22583727462.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426708e596f---56803359000.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362e64b8d8c---98338190320.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/tajoxanofufajabefukat.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424e4219cea---tinanimoguzudabosonawozam.pdfIn PDF document text
    • https://m-audio.vn/img-m-audio/files/89286327201.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/89464689033.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/dufoxomoburajik.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/kodejugi.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/f63ddc5df26a6f610808fc147fe16ce6/79406968186.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/96483217565.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/14377084710.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/51707868673.pdfIn PDF document text
    • http://proxima-design.cz/files/file/rupufadejenadaranovi.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614229c7a68e0---fataba.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_off0000d7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D8 10260 bytes
SHA-256: 518700e6c4cacc87e3a906e0ee6f1d206df4958e37d6630a3df777b0671531b6
font_01_sfnt_off0000eef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 18060 bytes
SHA-256: c874f23924272fad99a44e9832a27a4446437acdf4be40be17ca6e7448c9ed53
font_02_sfnt_off00011dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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