Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbcb5da9f1ad13f8…

MALICIOUS

PDF

97.9 KB Created: 2021-07-06 23:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d7208e42067c21ca84ce3f780267d1f2 SHA-1: 2caadc810bee0c4fbff39e43d56c4a16adc98cdf SHA-256: cbcb5da9f1ad13f892381ae2d26a66f9ae6eb2e54399dffc77376ca6638e296c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the detection results point towards a malicious document payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9169

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=coin+master+obb PDF link annotation
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160832b0a1b9dc---96771543585.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/pogokizuzij.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/17e33b1daade66db06a5fd94558f290c/70748112863.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/j4rsnn7k3oj9pi54c5n58ev1jh/xabizoxisotupejikor.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/894af361afa0aa8d31760db1af1a9874/vijiripoj.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/bejevelen.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/96262630856.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aa7b8a656cd20cae4fd7991aede27382/xenumarezanit.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/74ee6a6865ae44f1ced3ad3fbeb1f863/55857207408.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/98151825378.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/23567374908.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/jatexoguremobeg.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/maguvabukazagevidimigeje.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e296beca61---1388071217.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/ba925b4da153776ac2ca8592f9be923b/venakapu.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c872b3ed0cd---tapapodagopog.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/jovipisovim.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/40831883812.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/4ee9346b91887c2a2bfb47b2d5ae590d/ralegigi.pdfIn PDF document text
    • http://aimic.com/userfiles/file/20506443303.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/575d90d2ce15c0c129cc04e98f149146/30563943011.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/jejuturiwix.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/55891470109.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/43969828619.pdfIn PDF document text
    • https://taperagi.com/contents//files/11785426272.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/339df7fb1aef36ed92e442a1df89046a/87433267270.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CE 10392 bytes
SHA-256: 0240feeebf8599b5d171e962b7bd995d4e67c5aa3a1ffc27db69e2121422572a
font_01_sfnt_off0001115b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12968 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_03_sfnt_off0001316c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316C 20304 bytes
SHA-256: 3d5483fc02d937f739ee25d74e910ce71989982ab4b38fd01fdec1e1845f6fe6
font_04_sfnt_off000163dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163DD 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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