Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc81cdeb72acbf8c…

MALICIOUS

PDF

82.6 KB Created: 2021-07-13 17:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f5a54ae716b1eeaf32de79f6f14c4f37 SHA-1: 222f06af1e6cf7816b22a0d392b5868123cd2fea SHA-256: dc81cdeb72acbf8c7efebd073f4ed0208481ec89e9f285e1b69f5a97e8409a44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://krisoc.ru/uplcv?utm_term=directions+to+pilot PDF link annotation
    • http://ya-ke.cn/admin/upload/danekobavisediwufatuwuza.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/24939188022.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cd4b52b2f---mevexorilazeneti.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/14623663695.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/14955897397.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/borusekasulafa.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210508143043144.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/wudubibonimofemotoda.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/a7a587ddc4ffd887d50c9ac2f171aafd/pebizexiponexeril.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/29357974385.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/55689712120.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a9669b14bd9---geriwubir.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b378cde562---gidelopoxavatupir.pdfIn PDF document text
    • http://imaginove.eu/data/Files/lefosidipizaxi.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//37113237059.pdfIn PDF document text
    • http://erex.hu/upload/file/fugizopokezatosuwowi.pdfIn PDF document text
    • http://boldogelet.hu/media/rajuvaki.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/80251250483.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/48385387660.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/kalojipoviwavuzigezuvize.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/368b66d5837da9b51b4ba38abfc20a6c/jesetidugulakobedazazufu.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/eoid23v7olie5gpnf95tlc8llu/24280392270.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/8d792717bd0c24c9a7e05ee9f281d68e/88146404630.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_off0000e24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24E 10204 bytes
SHA-256: c667bde2c1925c26afe96252212a3f5bd30ecc8c48503740cddaff1a3636ddfb
font_01_sfnt_off0000f94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11160 16860 bytes
SHA-256: fda8e83bdd2db1946a44e551f26675badcfa53f3e727b59c796c49cfe15d6966

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