Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee9ab50c7b5b437f…

MALICIOUS

PDF

85.5 KB Created: 2021-09-19 05:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 795b94adf5ec1c7f6d225c277d118308 SHA-1: 5d18730c010ab468b7af28102957805bdd67da99 SHA-256: ee9ab50c7b5b437fa3c91f75733aaa51d9e7b7abd413599416c076eb22bcc68d
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nilulexo.pdf In PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/75115307749.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/47603455575.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/91234029286.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/vujuzefasob.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/tirezelewazosofijun.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/nixemavinawe.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/60t4slcd22q5358sefgfdjidee/21207151659.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/77662002491.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/56540920770.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161417689b1997---sadilibij.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/4ngj76ks5641aclbfkgfma1ii2/78080225162.pdfIn PDF document text
    • https://aspart.ro/ckfinder/userfiles/files/jabazerurawo.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161398060807ae---9253848533.pdfIn PDF document text
    • http://www.bandungmesin.com/file/popowofonimamawe.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/bbiuopirofv1smftb7rht3587q/zugiriwib.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/padidebeni.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/mawekefu.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/43429445555.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/37669477500.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/13532549431.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/sufiboderadojituwu.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/tezasagon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+get+icloud+photos+on+android+phonePDF 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_off0000e635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE635 18628 bytes
SHA-256: 9df267e6e81032588fbf25479107d501bdb0cea79f199e6b51abe1c54188b38b
font_01_sfnt_off000116e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E7 10968 bytes
SHA-256: fd5bb0eb484ba5e434512a3bd774575d0719092f279505ad7ff6b26be085fd46
font_02_sfnt_off00013027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13027 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1