Malicious PDF — malware analysis report

Static analysis result for SHA-256 225f0b3c54c0b794…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 10:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f7a2f6bdff4c92d08ff718c9e319f950 SHA-1: 1844884fb8dd779a2b3276a555414cd8d911ec64 SHA-256: 225f0b3c54c0b7943e9012cdcc73be67b3a1a20a606d3b3c9b94f857bfb741d4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade static analysis. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://archism.ru/uplcv?utm_term=grand+theft+auto+v+download+ppsspp PDF link annotation
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130700569ddf---31882912405.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/letajajubebiruluvuset.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/vilojesajibada.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/91152880420.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0b68e1a9e---maxes.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/patijumog.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/68908416289.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210907080605_1117413246.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/letojepere.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210912010327.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/34619839164.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f62392d191---64346180655.pdfIn PDF document text
    • http://mousike.it/img_ins/files/71225393712.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/6486929803.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/88551042636.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210911045920.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/temuritodafofa.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/kufijabigazopidupawalora.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4bf6d4188---poraxamopisanovosumem.pdfIn PDF document text
    • https://edarky.net/data/file/dopegegabatuvesobum.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/kidupogakeduv.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/93540604152.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_off0000d7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AA 18444 bytes
SHA-256: 090b42da4a0ecf1e666e13dd6fe737fbc199dfc520ef5bb24674096274a65b53
font_01_sfnt_off00010744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10744 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5B 10796 bytes
SHA-256: 62f2a000c77502a2ba465b94c79fd4e2b2bb52b0d24ccb1cd103351a9aeb6d55

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