Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bac1d237be0616c…

MALICIOUS

PDF

74.1 KB Created: 2021-09-01 18:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a308baeac96465a4d016165f6b902703 SHA-1: c06a9ddffa86b03f6307dd3cf35a07a09bdb95b0 SHA-256: 5bac1d237be0616cd5b278a3350bb886a6157eb90b3bef25e5e3c0a6371bd3c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload storage and other disposable hosting sites. These links likely lead to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://walkercombsfamilyreunion.com/clients/d/df/dfd517ab040340b2551da60fba195f5f/File/71942418384.pdf In PDF document text
    • http://friulanapanini.com/images/file/18882233632.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/f6254d7aebf3105272f3c222d42c97f1/wibulaza.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/7a83befbc50b6f965b67686ef829d1a9/91548505573.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/88233261864.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210613_190226.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/17867488088.pdfIn PDF document text
    • http://hydrem.ru/images/file/15954062579.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/62853189901.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b215286c78---visituravetorovikaduz.pdfIn PDF document text
    • http://abroadster.com/files/norutokoxazeb.pdfIn PDF document text
    • https://go2germany.ru/files/file/dotigexezowitamawidanezug.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/37102366327.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24da80d648---zowibawutuziduraruzitapit.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/41859554873.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/74288497443.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/pexepinixodibirefexexori.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/covna6ae99hdhukunup3rt8rgu/83373326597.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/209600fdb06e782ce8a3f7a05054cc1a/17979911163.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/64489c95006601efe4bf8eca6611cc4a/julipubuxiwivexoku.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1fbdb65613---zurefowerade.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/87f12615321d329ceccdfec680b01156/velegewujajuwago.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/d3jrf09fh0jqceu51lcikr2s18/gitosimetuwiturufabotidal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=a+ripple+counter%27s+speed+is+limited+by+the+propagation+delay+ofPDF 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_off0000bd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD552 16524 bytes
SHA-256: 8529afff98abc884ad0bc2ea0c8c8abf8ff1e99bb50da309d2cea296f92b0aa8
font_02_sfnt_off0000ff71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF71 11436 bytes
SHA-256: cd5db2adb9390626072b30dca376ee7c645509a25d132c310b878dee0c325322