Malicious PDF — malware analysis report

Static analysis result for SHA-256 763cbc1d426c6bf6…

MALICIOUS

PDF

86.0 KB Created: 2021-07-03 03:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7e761873a209a42eb07c7c9139739606 SHA-1: e65bf7c6978ece04ae49ec1faeffe5f87f49e9e1 SHA-256: 763cbc1d426c6bf6274448f3c485f0e53bf815f148eda0c694589d2f2abd0d16
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised WordPress sites, suggest a link farm designed to redirect users to malicious content. The file's structure and the presence of external URIs indicate it is likely used as a lure for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://synerhu.ru/uplcv?utm_term=heat+of+vaporization+of+water+at+different+temperatures PDF link annotation
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073f84df34e6---fisazebasebugekokif.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1521c4fde9---65857981341.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f29517d3b1f13882f848b4021e7edc5f/87329648202.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/vtkr30ffbho55v5jekc7b0778a/50590263122.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/zivurawovobaxipop.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/lemipiluziviliboguxepome.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/2d43960a39404af40f1825f653b21072/4788642948.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608502bf909c7---sakilafogunupupezesinami.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/26810275443.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210512113844.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/fdt8hdj8mmma6nc112v1vtm9nh/95825142246.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b655eebe187---mirula.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/sevaxojuvivuzarusi.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075da32bc00d---rosit.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/653e9f43eb4b03659f4fb96b041591b6/91994229936.pdfIn PDF document text
    • http://1959blackshirts.com/clients/866684/File/xobigeradovefenob.pdfIn PDF document text
    • http://starrsgazette.com/admin/images/file/15953247601.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/ed7c9007f99cca4966d2f34f40ffb8ad/43245580497.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/68015510529.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c01d5144506---38593330719.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/082222321256.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/61b03a41464ae53c1360bfd7ae1f9235/limixabigij.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_off0000eb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001036e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036E 17060 bytes
SHA-256: d2db1cc3b7215ea0f9a950ee48bdfe2636ad0c80d61a835ad7fb2cd214c30e6b
font_02_sfnt_off00012f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F27 10916 bytes
SHA-256: 0bb911631f576333ca1b7fe7fd2a3251d4a9fa1dc0f12d672e1a809b364ac328

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