Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7312a4b9010540a…

MALICIOUS

PDF

92.3 KB Created: 2021-07-02 12:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e3836cbbf1f0a39bd9fe8b02ad1df89 SHA-1: bd918dbb8d9e189839704010d7541fe3994da1f6 SHA-256: d7312a4b9010540ab2b180e0165b0914bdb7256527c402ea32eba4443c96927d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised WordPress sites, acting as a link farm. These links are likely intended to lure users to phishing pages or download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 https://medvor.ru/uplcv?utm_term=free+uc+pubg+mobile+android
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/600d51f098341b6283c34154cb798ad0/mawerakukisinebedeto.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e5781c43c---xovukirovetadikupa.pdf
    • https://kuepancong.com/contents//files/92531798737.pdf
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/kezedokapal.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/1e4e822fe736b8d6375f98c206f12e5c/kojamugon.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/s5rahp99pmaklqp3sk3qe23m45/41820453901.pdf
    • http://ekolojikweb.net/upld/userfiles/file/61387040136.pdf
    • https://hkparkkonutlari.com/image/files/23929079045.pdf
    • https://afayl.com/userfiles/file/12194572151.pdf
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26999050832.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd123c6167---pilejuguzetareroziwubowaz.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160700062a3e3f---vixerefosuwonik.pdf
    • https://csodamalom.hu/files/files/19928982133.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/rukawiledinemebi.pdf
    • http://ballstonfamilymedicine.com/clients/861402/File/93544201282.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/7c38256e10fef388c7f815dfac772c0e/xuwudojanunofexudu.pdf
    • http://chothuethietbi.info/img/files/dubakig.pdf
    • http://megalabsrl.it/userfiles/files/21117523454.pdf
    • http://www.aqsclimited.com/EditorImages/file/7916092161.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ae355206f84---78184352196.pdf
    • http://porpora.info/imagenes/imagenes_contenidos///kowamamowajuwoletivo.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b89d7836e---fufamasafu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec84.bin
6e171ec28ea6e27154db2e2c85c46f89822afe68138de5445453ccef44b7e170
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 10808 bytes
font_01_sfnt_off000104da.bin
f961ee6308e4789752d6f960776f1b3c7283d6a9b40668f06969e1be9ce81f5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x104DA 17136 bytes
font_02_sfnt_off00011de1.bin
af71aa7236c4934ca860a550c096e701ec045e66cf7ba3abef47b69f0e7387c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE1 17608 bytes
font_03_sfnt_off00014bcb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BCB 16792 bytes