Malicious PDF — malware analysis report

Static analysis result for SHA-256 9304ac97a85e35d2…

MALICIOUS

PDF

80.3 KB Created: 2021-09-02 07:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eae1f8cc82405bd112622a78e7975885 SHA-1: 2153abbe242966de6f1e0c82ca83ac287711eea1 SHA-256: 9304ac97a85e35d25053835dcc73d11ec9833ee27e39cf549b4fa3ea27ae1cb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external websites, some hosted on compromised CMS platforms. The presence of embedded URLs suggests an attempt to redirect users to phishing or malware-hosting sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://huntic.ru/uplcv?utm_term=dynamic+stretching+for+soccer PDF link annotation
    • http://ahdongjiu.com/upload_fck/file/2021-5-15/20210515132235529231.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/93256234037.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vk8jlea4oavq6b52jjnbd00pl3/katazakupobadane.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/96b9ba741d6d7627d1a13550030a9ac5/18877541276.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/tanudasogu.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/feganobowuvapapakeguzoz.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/9f797b362594fbf40acde53e8fcd8cdd/femumawovetoxizafipe.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b762b09e6e8---94153711985.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/66980414455.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc1c8d043e---84737761264.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/94372641626.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825240f24f3---45932809687.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d20fc36bb---2671337905.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/fabovesaruki.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161050d10a1302---naboxazemozuxebapak.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/93587397777.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/kevunuletogosugu.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/rurexololixuzu.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/40417344860.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/12711184827.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aae6303ace---zaretezajaru.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/41955526151.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/zaxuwakutanewurit.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_off0000d76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF83 10852 bytes
SHA-256: d9fb4fa97a2f569d9e95f53e835738fbee1645cb608233eec5acebbdbe3e1be4
font_02_sfnt_off0001086e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086E 16952 bytes
SHA-256: fad5aa77f1bc9cf85b478bbaf71056479f65bf1a4c2fdf0ea8eaf4ba35a787ee

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