Malicious PDF — malware analysis report

Static analysis result for SHA-256 653b40327f96a380…

MALICIOUS

PDF

81.1 KB Created: 2021-09-11 08:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 08b5dbf769fa0710732153836bd2f623 SHA-1: 78c6e8f11db0a54d8a9873d1bd7d40903fdf9dda SHA-256: 653b40327f96a380563b3f4ac23165ecadf4e302f51c2a73de7164fe4c9cf78d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, some of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.contal-farmer.com/uploads/files/16384984899.pdf In PDF document text
    • http://alcantara.cz/data/file/80715571646.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16135ca64023d5---54765666750.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/97083187362.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/65056207157.pdfIn PDF document text
    • http://mundialimportweb.com/userfiles/file/gikoxusetinufukipe.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/12303218595.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/seforoj.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/koxemifikes.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/84616157347.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/pazupozovur.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136060dc0d6f---ragovozanurego.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/kudimum.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/65320921983.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021090212135973499.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a42fb128b---75536604471.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357344a206d---zibegu.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/fivesenupukepo.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/fd7335a0cbb8ad1378ecdbf438fd0943/zetoki.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/zonewimabujogoxuzewem.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/38717323663.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/11938700181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=harshad+mehta+series+watch+online+freePDF 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_off0000d95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95E 17096 bytes
SHA-256: 7786e76d4de5ef08503cfe116fc68995a2cd9517b0c0c901ae2855fcd6668f12
font_01_sfnt_off000105ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BA 10820 bytes
SHA-256: 070f831028b5464905230d49d257fa751b5d8e9b448d4bfb4ec1743c7e2a46e5
font_02_sfnt_off00011e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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