Malicious PDF — malware analysis report

Static analysis result for SHA-256 d506bdff4801dc20…

MALICIOUS

PDF

89.8 KB Created: 2021-09-06 05:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8cab436714c88d324e70a7353b86d85a SHA-1: 6ba68757e787e3c70443d0de05b6aff2f3d845d7 SHA-256: d506bdff4801dc209ebfe2cc64ca3ecb01ad50a0711cbf614c466709da646263
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised websites and potentially malicious PDF files. The primary purpose appears to be directing users to external, untrusted resources, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://allytemp.ru/uplcv?utm_term=the+autobiography+of+benjamin+franklin+dover+thrift+edition+pdf PDF link annotation
    • http://amuseonline.com/absite/userfiles/file/xikubinipewejitofisolava.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/ropugasutitexufup.pdfIn PDF document text
    • https://computerzone.pk/file/gobaxupoxiviw.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210601_FCF4A69EE200B7FA.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610eaf2f54da6---81308999456.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608720a70fc5d---17682162632.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/sumilu.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/80953461148.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/1km430pqmdkhbfsdfi5h4me2gn/fulemosofedewewibel.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/76864068518.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f02c7c2cdf---93238248035.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/2430293178.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/78a19a677484acc865335bbc564319c4/32806810383.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/up0cbltmd73cdajdjljka17b5q/rurufulivatulupezagopo.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5cc34b233---47217755401.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/80826362832.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e5086674f---77414506394.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/qjg964qjoujbn1g7f4549iu8r0/risumuvisogepin.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/17873232030.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe5fd5d4a4---15973810698.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/96323018152.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724d92aee6d---rejawiniwometugoge.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ctqtsoi6u2sju9bn465ogugnk5/37085759950.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/69272379256.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/28629613678.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_off0000f793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAA 11380 bytes
SHA-256: 9120551cefd11b1e85cf557b55207c570e6f21e37241b468f4ed51d18da553e8
font_02_sfnt_off000129cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CD 18108 bytes
SHA-256: 04ff2a6757fa162406ed5728db0dff4d6ca21843dd6c05f117af3de84e1aac35

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