Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea81ebf8ac84777…

MALICIOUS

PDF

88.3 KB Created: 2021-09-01 12:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7ba2523232688a14e16d1d3c31489c40 SHA-1: 9f270f015e535d02edc15abc4bcc06bbd825d7d8 SHA-256: 8ea81ebf8ac847773907da05066bee7d8d1d4e26ea477aa7dcdc593d5f76b66e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84a1f029ea---vemapuj.pdf In PDF document text
    • https://blokhol.com/upload/files/wujekerexu.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/disamonekekam.pdfIn PDF document text
    • http://d4smontreal.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/ripejeniz.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/e7af4c4ee7f1a0a2c6d17c0b6852cb3e/pumupulalivotivi.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/9aa874c24da3ee8b6da06b221e76187d/10209375529.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/0bv5fkcu2vn2c3rcop099fpuud/89363336685.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210814043811.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afc551d5917---dimunukogejozibaposiva.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210522235335.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210629141925.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/42850119120.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/21851543444.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096cb9ecb3fb---54846798589.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926dfba84fd---teluvujo.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a04e1b54a9c---livolosutoresarot.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7237d0371a---jozuzalera.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/37e957f1a53eda9c9e2922908e11ecd8/biwowutim.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/slfmfjk5h5r806dki6dm21ug02/zukabuvozuxurok.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/83510390873.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/44916218117.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160837bd568ccb---fafopefaletaburujo.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc34cc355ac---59668482344.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/giviw.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/80607288093.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160728d07c3850---459463535.pdfIn PDF document text
    • http://web68s.com/upload/files/gomogexolexexuzenag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ldl+chol+calculatedPDF 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_off0000f167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 19196 bytes
SHA-256: 5a52d2c9593332e46873bad809f6271fd49269dfb17029aae8ca69488258bc16
font_01_sfnt_off000123f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0C 10060 bytes
SHA-256: ea956a1ac56a5b66fde71799da12a8381c6418e299ca19a0762306478d13f23f