Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6c677eea4bd22f…

MALICIOUS

PDF

81.9 KB Created: 2021-09-21 07:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: db584bb132272b527ee91d6ad4d9d098 SHA-1: ee9893ec68cfdfa8e6a65810553d5b23430699f4 SHA-256: ff6c677eea4bd22f95a6ebf1b96c263087083d309bf7e68546aa00e659bab661
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains, with one URL explicitly mentioning 'download gta sa cheat'. This suggests a social engineering tactic to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://mwasafat.com/uploads/files/deporarefir.pdf In PDF document text
    • https://angelsstaff.com/uploads/file/dejixep.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/838211681.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/novoponiwelolevixosemifux.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/94770810181.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/47952000375.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/vazibafilomazote.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/18972954804.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c943e406e---buwevopasemuvapimut.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16135267119035---kuxetexefivegison.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/bafubekoludob.pdfIn PDF document text
    • http://ranchobg.com/img/file/gawikozegedodowebala.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/85001106651.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-14/20210914152244697353.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/9865287232.pdfIn PDF document text
    • https://pincodehub.in/userfiles/file/139320354.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fc530e590---36243450087.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/99843865500.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/59633662756.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/dipoxeku.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/81295556901.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/25528141641.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/56296271301.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/jisaguv.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/neleliguzafuwajexukaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=download+gta+sa+cheatPDF 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_off0000dc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 18000 bytes
SHA-256: 3c6ec62323adec805b9cc9c41568421c9e7ef8f9dfaac75684eed3afc8058101
font_02_sfnt_off0001225a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225A 10544 bytes
SHA-256: 4cf822c416d60cc52c2d28f23cfafedf2113e4c374a71b25c9aff0b814c27707

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