Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15c0feff17f5508…

MALICIOUS

PDF

88.2 KB Created: 2021-08-07 03:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7d46c53a575588a92f6dfd9d83ca703a SHA-1: 29434942e49e4d0ccab78940ddec9ae21a91dead SHA-256: c15c0feff17f550867c5726a37e73f40401aafd8d15c0b1bca2a9b550fd2cf35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate an attempt to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=personajes+secundarios+del+libro+el+caballero+dela+armadura+oxidada PDF link annotation
    • https://lapalettedesarts.fr/gestion/file/27148403930.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74f13f12e3---37276392621.pdfIn PDF document text
    • http://midel.me/userfiles/file/67596498783.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/navutomojubofowemam.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/50773921084.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ff6fee28184---3688550849.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e7e105dc7---jifitabezufokilagulovuxib.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945afb034c1---fowabomegufofajubemejobe.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/28396003478.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/difolal.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/mipina.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077b6edc305d---56138568820.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c614384e941---vefak.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16079dffb3ec6d---xekabekepuvagubopivox.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/25535465642.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607897a52562c---61677065993.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/60702405246.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f84c492b4---71235336921.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/60050671529.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/48549956918.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/vogala.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/lj8kh2h3gonproboe96ua32n67/jopabo.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/dupovotaxobazusi.pdfIn PDF document text
    • http://eths1967.org/clients/6/6b/6b000f7c2bca5b3a89f93fde6b54c5e6/File/40548435671.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_off0000f280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF280 17800 bytes
SHA-256: 8acf742b8316f1b0e229f6fe5599dee8309c41759a8e76acbc29574ae55d0155
font_01_sfnt_off00011f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B4 10908 bytes
SHA-256: 1f95f7d929d66b656bf54ef7dbd247098b15cd548f09652aa20b584b2b9a276e

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