Malicious PDF — malware analysis report

Static analysis result for SHA-256 625cad140b50919e…

MALICIOUS

PDF

92.7 KB Created: 2021-09-03 16:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a758e154f318b97101a76b944dcdcce4 SHA-1: e5fd9a6ee4857d2459bccca07b0a6c879b2e1d5f SHA-256: 625cad140b50919ee6a64bf03f70be515c9cb27e8612ecbdb29849872d31b29c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links to external PDF files hosted on various websites, many of which appear to be compromised or disposable. The presence of a link farm and the nature of the URLs suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/qcgc5a3gldif7fosh6j4dkhpb8/93907653053.pdf In PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/lowaxireximezerewid.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/tuvutulaberepivotogozemi.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/xopebefisotodasetodigadux.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/61162827827.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/duxalupur.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/jalevoxebozezum.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/64935880023.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aecf09cd293---piwizevetagefuxajulezopiz.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/63985356926.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/34478792860.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/90971243834.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/39ceaa345dfc6e7ec0710f4c61c1d215/dusaferu.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210805001111.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/jokedevuropaluwila.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609adb40e026b---76355430917.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/65565599195.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/91975334a700332a3c887f25f3d54c5c/tibodavadudugon.pdfIn PDF document text
    • http://arucax.am/user_images/file/94017240411.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/c899ba2de18c17d85ac831658207099a/13892620577.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/rgf7b8lc0md3u6d57rdv0h201e/97478870439.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/972e6ca646341e608542e55c3e66cf25/68228241583.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b622c240d---2754526055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=conditional+sentences+type+1+and+2+worksheets+pdfPDF 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_off000103e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E3 11212 bytes
SHA-256: 4eecdf1eff652abac6829ebafcfc33da5cec68c1ca0320bb3704beb82c4d4c1a
font_01_sfnt_off00011e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E45 17800 bytes
SHA-256: d5fadbab8ba8e943ee0c4df4d72a814d48941a93ec9b6f55feec3096ce95b5c3
font_02_sfnt_off00014c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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