Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84cba78c5f863e3…

MALICIOUS

PDF

73.0 KB Created: 2021-09-01 13:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b48dc3fb5fd866e14f37c27ce4c5c5e0 SHA-1: 335e2787510c032d19afa2a101b11912066c2abb SHA-256: c84cba78c5f863e340d36f8d7481a3130e82ef3f1d4a2b3df740764bec31ba46
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=forensic+science+lecture+notes PDF link annotation
    • https://masihpt1.com/contents//files/kelepupej.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/2863988762.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/dujisonogipovutorapega.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/7db2d3237e77ac251b199eecc426266e/doterob.pdfIn PDF document text
    • https://ptogel2.com/contents//files/minojizalitid.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/sixibexom.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/28723130301.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/39078441535.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612398096d003---sidudixazitupufosaper.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/54663570536.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/werimamijunigugerizopuxal.pdfIn PDF document text
    • https://chp-travel.ir/data/file/78033856915.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/47381260409.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/17823814029.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/27213414418.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d125b89e9f---55256873398.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/makatipiri.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/65775116092.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d401445e1---97573262762.pdfIn PDF document text
    • http://mwclass197050threunion.com/clients/0/04/04fd426b2d2cb16e649a8dfb8bed347f/File/wilugixopuleloxoziregobu.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/30507867138.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098306a56099---57015762042.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4f288dd2f---kivixetudozujuroz.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/20795815383.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_off0000bc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3B 10136 bytes
SHA-256: 2c8844ca3af34b26d44b5d67fc395f62af01122a52078449e58d4d706c975975
font_01_sfnt_off0000d303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD303 16936 bytes
SHA-256: c2ad2cd580ccf373c791418b71408158de473151c2f071bd6944422ce7001d93
font_02_sfnt_off0000fdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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