Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0b61f44df2dbdd8…

MALICIOUS

PDF

86.1 KB Created: 2021-08-15 05:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: fd5691dd1468c161e40483460a9c16ae SHA-1: 854b7af194d75fe6cbd47b6c1b8541c843430043 SHA-256: d0b61f44df2dbdd84c64191028f75359ed955ca3ca1eacef096d5eec0b6e0f30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs pointing to a mix of compromised CMS uploads and disposable hosting domains, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it may exploit PDF vulnerabilities or serve as a lure for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://garglob.ru/uplcv?utm_term=ideal+protein+diet+phase+1+alternative+plan PDF link annotation
    • http://bsinteriordesigner.com/userfiles/files/36592998737.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed46b3cbc6---romaravuxedabawabilazux.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/20454933225.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/2741604617.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/jakilumuzeraxokex.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/94485591575.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/90547100485.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/sojukiv.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/kosutiwafogadatojageku.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077d6169a102---45861534527.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/4bfd6a616aae1ef489a22a92aba457e8/dupagulezegow.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f75e9a8556---92810278360.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/nuzaxoduzazujurad.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/9702169233.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/98154758969.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a55a3dd325c---43849740312.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/42244905290.pdfIn PDF document text
    • http://anm-av.de/uploads/files/dosagataketoxubokedisezek.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/rcff4jsrp2t2km9ofg23rsefc1/43847328943.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/73316810030.pdfIn PDF document text
    • http://lokale-uzytkowe.pl/uploades/fckeditorfile/xowexoxesebalugug.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b23ed6840---71658575840.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/biwagemulevifude.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/61783808750.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/53390561666.pdfIn PDF document text
    • http://cmtsport.com/pliki/65412731908.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_off0000ed68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED68 16756 bytes
SHA-256: 8e30159863d772cb42c34c223635991172ea6cab61c9917e3ef028b0b1ecd4ca
font_01_sfnt_off000118dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F4 10556 bytes
SHA-256: c83dc2edef8a2e8cb86af7db5421dbc8271c8d6d2554a327ef4bc31036fbdfed

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