Malicious PDF — malware analysis report

Static analysis result for SHA-256 e585f103f7a67296…

MALICIOUS

PDF

87.8 KB Created: 2021-07-22 20:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2f19d0097e35538c1c677cc3243d55a7 SHA-1: cd42528849b72b652c901a53cd711309e088f47b SHA-256: e585f103f7a672960538f77e6253c7657f47b3e910bb5b9cb5d70486cdcb06ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve to distribute further malware or engage in phishing activities. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt at SEO manipulation or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/r6c14fo97h9vad4c7q9jdg6guq/gomeselolasetosuxiselufiz.pdf In PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/eda24e2ecc605c05a6754dd676281d66/87869847027.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/c1q7a1ngvldo53sicbh8os3dg7/pimonekuvunojeburezezo.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160872b2e7fc99---3876396963.pdfIn PDF document text
    • https://adreshosting.com/calisma2/files/uploads/59944549871.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/59307032594.pdfIn PDF document text
    • http://monkeytailranchdonation.org/clients/e/e8/e82116dd0b5861b0917add2a69208af2/File/zubowobeguw.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d4918369b---guvizogisolunewi.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/pirurudawosogekezogan.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/powoxatozefegisofodumalor.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c0efb966252---88054659292.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607016c46650a---lasovadir.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/8f3f4ac66a78307a6a7196ea11b97b8b/xiboxok.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/25454099594.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d31150ce26---siresomizidevosap.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f902a48fe8a---22598697563.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/39851151559.pdfIn PDF document text
    • https://doganagolosa.it/file/donuzatavozigusato.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/824o3273rttetnfee0nh0p75d9/56064435100.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/43914599740.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/vawipub.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20216261956385522.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be2277d611a---dipebabuvinisudepoji.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/64893262171.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/14491944494.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/744205d1bd6b2ca327e4a461761b7249/zoganatosalot.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/tegapozari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=top+10+ppsspp+gamesPDF 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_off0000f44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44B 10292 bytes
SHA-256: 8afd01badb9423b654ee1fc87696c21edc1385a92135e09db59f3d8483f00c3b
font_01_sfnt_off00010b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8B 17032 bytes
SHA-256: 5b898094d1ce4fe36cd50bf86b4b64091130ac8f13c90979801ef43989345478
font_02_sfnt_off00013818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13818 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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