Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f97f396a07fa4c…

MALICIOUS

PDF

72.2 KB Created: 2021-09-29 09:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b064199521f085a93a0eacd439660a60 SHA-1: 535de8d51cfb5563538ab17674e5fe0794ffb430 SHA-256: 71f97f396a07fa4cf496e79bea433d76d8ad1e3b1d0dfbd5ef698e59cf17c1b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of link farms hosted on disposable or compromised domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://oniceh.ru/uplcv?utm_term=mortal+kombat+1+apk+free+download PDF link annotation
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/51235436885.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/bexewofutanixitiz.pdfIn PDF document text
    • http://lactopad.com/uploads/files/xuwofuwegojoza.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/85970317072.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/57546467001.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2b9kus2ifd2e8aeaqn25cs7i72/tavesasepalanevekabefobag.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/78030362193.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/7577439474.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/89069814555.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/ninusowinuwomedakev.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zowunovotonazijajimikipa.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/61354314172.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/pudema.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/tixudoxoxuwonupemuj.pdfIn PDF document text
    • http://polletnv.be/uploads/files/moxagugoginekalelenujobuj.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16153fddaeb1e6---49044206341.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/kuxegogosatav.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/ramusulufudafubu.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/piwomizavisalaxuliwedi.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210906092545.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/5b236ec0675216dab9fa5fccaa9ec607/dadelesakuxisuregasal.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/vaxogusetonami.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/kisanijabokujamovabupug.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/fajedoganezadedoziwunen.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/64472763011.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_off0000b3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0F 18096 bytes
SHA-256: 2ba8062770ffd3c96f14ac0bca628557a14dd5192e4dadebfbfa954acd7b1b40
font_02_sfnt_off0000fa04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA04 10764 bytes
SHA-256: f2f5ef6437d6ad03ca2808c96ffa35694f648b3d329b6dc8cffadf6dc798b503

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