Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd399cc20ec028c1…

MALICIOUS

PDF

90.4 KB Created: 2021-07-16 17:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 55936833474bc930f9f26fdd374b081c SHA-1: d27bfba46e81c009dbb9e52061abd5d0a1c08be9 SHA-256: cd399cc20ec028c1ce2f2019ba648d844b8c0988a71124d9e636d25bcc89e3b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/hs12bh1f5fm8mjtkjld974qms8/26674005749.pdf In PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095ab2a37048---93618816178.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/fqbjrs0cld634akd0lfrpe1ujc/21753832014.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/6cho0ftfartjubud5mmaj2025c/gurukisinobubapowupufoxi.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/xewigewuj.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d2406605a6c---19667855098.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086f57998fcb---fijalujawe.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f986c02b43---38871818534.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/gogiwududon.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/hih1qc4rivk4cofkvjqd6qil1q/bulavamozebuwituxozopijeb.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/b21640e4b1bb6ddd9f4559f1d13086d5/66565768856.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/33192387755.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853af0aa666---dalutodemekan.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/25815952813.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160743d61a4ac7---8266925253.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/palepixasefulorarefuse.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/mhomv8bm3ubfsja5ng758np610/rijedo.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/89133133356.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/68912693746.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/3ruee8fgnk5i1sql5d6pbdhbj6/94807319610.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/en7nbij50kfaqrkat6lp45qe6h/7297411268.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/e5f3f4fdf0036421c9d5a608dcd1c8ed/80834650255.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/44285198839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=seeing+555+and+1111PDF link annotation
    • 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_off00010118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001192a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192A 17260 bytes
SHA-256: f940e2408a1dd9c170126e9e7c4b31c9b4ae69e1a0acc427dedb8a75c7617906
font_02_sfnt_off0001461f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1461F 10152 bytes
SHA-256: d0f87ad4802b891d0e17ee610e41bdfb92ed6f1f77ac6e2b6ff3261cf0b72d63

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