Malicious PDF — malware analysis report

Static analysis result for SHA-256 328cc5d63cd02a1a…

MALICIOUS

PDF

86.8 KB Created: 2021-09-06 18:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b2f55b1f234f4ceff2246a0f4c4aee2c SHA-1: 99aaff6215eb00d9ce33bf209837a51a792d8aaf SHA-256: 328cc5d63cd02a1a559156e0d6f8b81fff7684b9b6aadd9ab99d5678d33fb65b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was identified 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 URLs, many hosted on compromised CMS platforms or disposable domains. While no scripts were explicitly extracted, the nature of the link farm suggests it is designed to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=raleigh+burner+catalogue+pdf PDF link annotation
    • https://btegypt.com/file/70256683614.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/tiziretosigu.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec3046d93d---tabifekorugobikuzu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161121cb1606f5---26056010554.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a39425f69d---80594871363.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/23341963737.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/misubolifisof.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160982e975d77d---zoxiw.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f20e422004---46554179695.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/74a367f96fb1d3cd91700de648052337/95040115005.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/moxarexatelevuxivunek.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/13865158110.pdfIn PDF document text
    • http://vodnik48.ru/content/file/rotoxoriwidoxixezi.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/95287205.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/9a15dc48f221ee801a8463ba6128c5c9/76215099166.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/gisefapufapusafebososoriz.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/cqe4rcdebuar5gk2v9b62mqirn/viwebi.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ei6gtnmp78a3bvqt11052dgjkp/28614886545.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/74cmr43ndo56bf65bc6nm0ug30/timepipavezafugokebuluzu.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093b63e510b7---33607255786.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210901012806.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/15299780875.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/ranagabixetafirujejet.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21e9f85011---kakivu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21A 17712 bytes
SHA-256: 169f559d879d0f493471f666d5e6e147cae28b0afbd8b2e4fde5bc6a69aa32f1
font_01_sfnt_off00010046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11857 17924 bytes
SHA-256: 36aabd6d641be72d162cb6f9fca3994aa2aaf31f0857c97dd8ba48950ba69f3c
font_03_sfnt_off000133f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F4 11016 bytes
SHA-256: 6561eb932534cc38b3036be2993692831b0bb1495532331e29c122bbeb39432b

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