Malicious PDF — malware analysis report

Static analysis result for SHA-256 a267deb4b55e546b…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 12:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5de6782d31922a0f1230ac74cefbc2d3 SHA-1: c1f8f7d4ac86b715e40060599841e02ad128ad24 SHA-256: a267deb4b55e546b91f8bf599855f07aba5bd20244f559a53983c0d15b54d7d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://queure.ru/uplcv?utm_term=minecraft+recipe+book+pdf+download PDF link annotation
    • http://leasingtowers.com/ckfinder/userfiles/files/14407581438.pdfIn PDF document text
    • https://parkettworld.com/upload/files/porupaxawasim.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16133d1915ea7f---tapusetibegu.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/37305983510.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/fomekimudezirejo.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/34883513531.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/zowopatilotomalawi.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/59480836897.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/3924336695.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/61830326310.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/97361863285.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/nadunuweboxevilotasotigu.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/83003663842.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/68920903408.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210904_B9B7143C613F0F0E.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/10049501237.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/f283b168d23e1bb1a9e5370739106b32/ziwipimoxizodonivipifaved.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/52231269313.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/72282150396.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/dutololal.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/94503868154.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614511d49b12e---bisot.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/pelevof.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/98177545370.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/39861896544.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-4/20210904210417582542.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_off0000d982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD982 17332 bytes
SHA-256: 9ae704b72199e640f8b72b5593c1e25069e45c5b6b57ddc1e1f501d51442b29e
font_01_sfnt_off00010636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4D 10756 bytes
SHA-256: fc5c28331d44b5fb0446ad0f4487942d709f17b6a329301394801fce34595d0a

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