Malicious PDF — malware analysis report

Static analysis result for SHA-256 64185877fc1fe379…

MALICIOUS

PDF

90.3 KB Created: 2021-06-26 02:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8389baae7d653a24333667715855a43d SHA-1: 9912452b198d14839eb2012aa49cfdd719758b5b SHA-256: 64185877fc1fe3794a581eb06baf4a3db7558f0c8aa6ee67f6ce12da2cdb9391
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads or disposable domains. The presence of numerous links and the use of UTM parameters suggest an attempt to direct users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://xn--80an2aej.xn--p1ai/up/file/40792002262.pdf In PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/9010ecfb81f15b588dafba4ad657bed2/97464496129.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/50544949850.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073ccbf416b5---13609559458.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/af3645818eff167323848f4133ec7326/26081071346.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/92843435003.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160986ffd3e7e9---lakavewozixaxividozil.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8233e1860---sesirijazuloforeda.pdfIn PDF document text
    • https://actor-conseil.com/files/file/58709502358.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/i1v195c07tkls03s5thaesnsvf/tebuzulosexel.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b73049844---20493373617.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/76091311614.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/mupesamutexavamen.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d862b15a33---waluxegenutaben.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086eed3bb548---foxelivunoxuzusi.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/3cfpp71kg3dnkbg1sng1du6iqf/kinijevavobekokibuxowe.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210508/file/3215093442.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b92d1af03e6---20711791125.pdfIn PDF document text
    • https://tangentemag.com/img/file/parivuvudiginupimuti.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/dekabazekakusole.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/i7e78dao8bd2rns0so22pg5d1q/zuwugakovikopinot.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8bdc0345f---8939303331.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f2be41bab---vudipokelapatitilorov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=copyreading+and+headline+writing+pdfPDF 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_off0000fe47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE47 10840 bytes
SHA-256: e5b7aada7b979d5703961c545061925614859a0e45aac6be74a68eccecd462a3
font_01_sfnt_off0001170c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1E 17152 bytes
SHA-256: 85d33804a208cc20954a41e9fb73eb9f11abaf1db115d2a11896aee090eed224

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