Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1362b4a4739e15f…

MALICIOUS

PDF

80.1 KB Created: 2021-09-14 17:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e1248e94123d8c5c6e7454d616dce3ef SHA-1: 6498e692ae0a9268692769eb8c1d6be667acf87b SHA-256: d1362b4a4739e15f86ed3a9e28bec4bb39b209b86e8d435995ba6aa4e16f743e
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 compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://catamma.ru/uplcv?utm_term=what+is+reboot+to+bootloader+mean PDF link annotation
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161330e6e74ae2---tujalopezukenopi.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/83164808570.pdfIn PDF document text
    • http://all-premium.com/user_file/files/dusitarevaja.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/0c926c6dd34608f1df696e28a5611ec0/nimovifuzuwegelewukel.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/karodubotefo.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/zixigukixafosoxoxudo.pdfIn PDF document text
    • https://edarky.net/data/file/64418263036.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/77919879905.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210910033604_u0w9jy.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cde6586167---vulagetixij.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9e38df0ea---vozipagutomarevumujezisob.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/54049538933.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/95895628456.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109081248315065.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/92640669146.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/87321068345.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lawevuzujigolej.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/82300458207.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210903050739_630zby.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/zitofezipobidom.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/dexowovebemu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/28bea10a92a8f41255c5b7efc9c93e8d/96894255536.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/forasu.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/416c5ba7b57fab420381162ce6595a1c/vewezebabalaminarapolatog.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB87C 10648 bytes
SHA-256: 85eecd0484082c4caf6a72da0c6c8b7d5761f158d2dabfbc9de56aa4bfe4635a
font_01_sfnt_off0000d0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A4 16212 bytes
SHA-256: c06184c5f6d9d20901f8f187e2ecd7c93776bf2139025329771c372cc5517b9f
font_02_sfnt_off0000e676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE676 21200 bytes
SHA-256: 5f2a9e85b2eadf4e5dfcbee289c051beca7f315bb75252982312e756378c340c
font_03_sfnt_off00011a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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