Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e5cece6ea18ace…

MALICIOUS

PDF

139.9 KB Created: 2021-08-16 09:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 681141721e7835872ccd5d615c417ed1 SHA-1: 8f3f94598aebe24d16bff6b8d99393645566e3a4 SHA-256: 24e5cece6ea18ace192c2921f3ca87237271dd4e338c38a9a61c333d5d2cc577
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits vulnerabilities or contains malicious content. The document functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of multiple external links and the high detection scores point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://kassa.pl/userfiles/file/babegonaju.pdf In PDF document text
    • https://niboparis.com/upload/fckeditor/file/1627080710_1.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c83585e0f---sesesiriwadisavajuz.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/9aaafe69e45d0cc88973514f445ffc8b/91505373395.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/pewijefozi.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098d5eee24ef---bitafebinojekorirekomegu.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b005bbd5b9c---sagisabami.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/dedebizidimotepovesuluj.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/2069036702.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/rikiwojujul.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3f205b2ef---zupekufugoluzepewij.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/82887115317.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/e5j3ltmifd99921t5shakq52po/33807316292.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/80634990987.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0637e823b---31494301738.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2b0888d9d---xumirijagugopetodurabepu.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/44110633709.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5768c219d671ece9d789a01500a90d1b/toxinadazesodunutuwe.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607071f0d03e9---87370306873.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/94525146729.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/begopakovuvaputonalem.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/kebozobugap.pdfIn PDF document text
    • http://mid-europe-ex.com/vetupijafetixasuvigoduk.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098d35ff170c---wafikakefifuwojetab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=are+coleman+catalytic+heaters+safePDF 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_off0001c116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001d928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D928 17888 bytes
SHA-256: feaf59f619e5743b15363a2c3d4be5360bda4f48804fea87de21e37771983692
font_02_sfnt_off0002088d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2088D 10696 bytes
SHA-256: 7cd5cb47bdd78cd056200da30bce1bc6dc9bbfa3d9001d479f5fe9f96d99d3d5

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