Malicious PDF — malware analysis report

Static analysis result for SHA-256 252185d6e8fc22d6…

MALICIOUS

PDF

76.7 KB Created: 2021-10-02 10:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2dc95cfaf2e1ceffb52fe7addca90c98 SHA-1: 73809338d23f7cc4451929297ce6ef31f13ee6b1 SHA-256: 252185d6e8fc22d6b88681946f175bebd7d92e6d7d868fd8d638ec8317f94d79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress upload directories. The presence of these links suggests an attempt to redirect users to external resources, likely for phishing or to download further malicious payloads. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://krisoc.ru/uplcv?utm_term=difference+between+micromanagement+and+macro+management PDF link annotation
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b172c03113---45178190503.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/5569334805.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/lariluzatovuxewexu.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c05baf0af---81109009929.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/16972754614.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/maviw.pdfIn PDF document text
    • https://inc.pamlskovnik.cz/ckfinder/userfiles/files/riximowu.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/99649936590.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/53870376776.pdfIn PDF document text
    • http://househouse.it/userfiles/files/xomuxudidome.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/86844960444.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/27837932899.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/88528937248.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613062d048587---tozid.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/49646960340.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/88430582999.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/fisonegifeduxep.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/bugafa.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/53093813677.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/pobixerexibununuf.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/75604001128.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/pehietjto1f3uvmu7q4eqtqaqj/defivudo.pdfIn PDF document text
    • http://advertisingreports.info/assets/ckfinder/core/connector/php/uploads/files/tuvobizezarakagu.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/29225622874.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/82921607571.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_off0000c105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC105 10832 bytes
SHA-256: 0438b26015cebba615c0136f521fd38def865b75aae8aa35ecfb68ff13f09b54
font_01_sfnt_off0000d9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E0 19396 bytes
SHA-256: 11cc3f48cb560de99f572c67cfaf799f39b9d30b9ce919707f30cf699ee311ad
font_02_sfnt_off00010c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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