Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7aac018e8d9fdc4…

MALICIOUS

PDF

83.3 KB Created: 2021-09-04 12:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e15532366d19f3206ccd153a43e69f82 SHA-1: d17a4942a938c4bfb82ae44abeb0ac0c7ca977f1 SHA-256: f7aac018e8d9fdc48942d3b26a909f8910a672c0c0102a2358c4de8a65f7e76a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating a primary purpose of redirecting users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malicious content delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://pistant.ru/uplcv?utm_term=2003+pontiac+grand+am+repair+manual PDF link annotation
    • https://stijsr.com/userfiles/file/47655440323.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ernfd423f68u3uvoa1g81eoqc7/monerumidu.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/jufanawegufovarigufe.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/gesifuzawifurusewatapaji.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/ribejujisefeli.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e42c43dc7---fubumefobugede.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/29777078811.pdfIn PDF document text
    • http://odumakus.com/uploads/files/41991162580.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/xukewutiwavatelov.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/37600977080.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/1780884162.pdfIn PDF document text
    • https://sca-kc.net/scauserfiles/files/87690240920.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/dededetomulugukafujeten.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/fupojariruvinifuvapetiwe.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/38698178665.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/29862780911.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/fakisabujuta.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3136d522ee---17926566999.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b01bea204---66469528574.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f04d9e7213---31031906710.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720168471eb---detonubapuvupuxub.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a372c566b---84593266602.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/nf0sum3jl9nijfoe71liol4ioa/zeforike.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/29525286893.pdfIn PDF document text
    • http://pi-consulting.ch/download/mumetuwewamowuxiso.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202171689107209.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_off0000e22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22A 16840 bytes
SHA-256: df2ded537aa4e53e6decb1badd5caa847b912f2156501645b6dd93f389eb8250
font_01_sfnt_off00010e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12620 11104 bytes
SHA-256: dc13b8dee1e07c4a0e58c3b304e1cf7752ec780f7bb4c7d96d4adf80157c1ba2

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