Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8fa84ab08c1c6d6…

MALICIOUS

PDF

94.0 KB Created: 2021-07-14 09:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1232f5611c0f255b4764e5d7043852b4 SHA-1: 1ee6913c96b4a5f307c3bd986c36ebc9971f7ba3 SHA-256: f8fa84ab08c1c6d636d04dda0af6d7c55783cc039e6af06e20d335d14d54ccb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics identified the document as a link farm hosted on compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The embedded URLs point to various domains, many of which are associated with compromised CMS uploads, further supporting the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a15397b9abb---42142097080.pdf In PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/73be3ce436a26890fe63b1acdce8ed96/raxexulidikipigubezano.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210625_BA5F5A250B24F674.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/rg34k59311btuto42r49d2dhr7/bevodapesamaromakipam.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/cec399dcf3221c1e017dd925a09862b2/kaxaraxamaborupopabukino.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/robagopowojobapi.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/jnisk6ie9vggkriqgvbqekcno0/99065463076.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/211bf1a729a262c265e8ea43c1673eac/renub.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a02fc78224c---44745814544.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/gudejelakamokib.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6195ac6d4b---niwudir.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/gaworawuvenajutidese.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607848598b981---18522110330.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bade4bc6c5---dazomamirake.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/c4127ead34eeb65292f57ed7f9119856/tamupofijasezivoja.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/3e76609fb0cbda6df4994bca517a8780/57401649287.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/8715389f3e6b06c245ec3845be9f74cf/62939340849.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd4297570---73052515454.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/eb7da394f9745293f8e4f555a3139c59/rukuxonivefuk.pdfIn PDF document text
    • https://zzhqhi.com/d/files/jemad.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/e96cb93f5a30bf53a42addae5b627589/jugakekofesedifiwov.pdfIn PDF document text
    • https://eslms.com/userfiles/file/92616555650.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a05acb061d---34707957379.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/745uapb3ni71223m1d0t9faagj/82821880985.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/17262263928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=streeter+phelps+oxygen+sag+curvePDF 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_off000109f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F9 17756 bytes
SHA-256: 469053282debed9dc949329342e984dacf86e0a708e8bf04dadf8963d0ef4c09
font_01_sfnt_off000138bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BC 11016 bytes
SHA-256: 7dd3c618d98e332c8540fd892f3fbaf3ae065234c84bdc25dbb26684f4bafa30
font_02_sfnt_off00015269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15269 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1