Malicious PDF — malware analysis report

Static analysis result for SHA-256 358eb098e221dc6b…

MALICIOUS

PDF

83.8 KB Created: 2021-06-28 04:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3bbdb23e89717dc46bbc7e2217e1a750 SHA-1: 517cd4c7fc9683e3e2ed22e184695e3d93d2cfd7 SHA-256: 358eb098e221dc6be2142c343338b9b80a32e88b59f14aff486ca593ee02af19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://synerhu.ru/uplcv?utm_term=converting+jpeg+to+pdf+online PDF link annotation
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd681b1aa0.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/vumojomefivi.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/90298588001.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/nujomet.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/97357205770.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/tejobopovedi.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/beloruzarikudila.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/0f0dafdc3372580c2228ce8cae09995b/famabasikuvapajugajoj.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3fcd8c1f39---saruta.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/dhgi1s7hfb7i46qvve04nah4us/14058840739.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/lrfqubjt3siqcpc2udt2gtcucm/jiwutikozamixob.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/339105362.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/7d0d83b955f0d1f7dd444682b251c08b/weminabigekofas.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c642509cda---36492726296.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b1413d87667---rurubilovujud.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/93923144054.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/bizivasozovif.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/wexadenasejavatixeduwidix.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/06i9a3jaf5s37ap795vroses98/wosur.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0321cd5dc0---59102505450.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/gutemubigisuxako.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/tujafo.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/24734777819.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/zewopu.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_off0000e666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE666 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE78 16744 bytes
SHA-256: 50d74bb9efb2724a98ca80e1f6c1ea43ec6d7f49451cc890f0ff4c691358bb31
font_02_sfnt_off000129ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AE 10572 bytes
SHA-256: fbe22b584ab264c05d6074b81a0155ae0ad88db4452e03db06875df9a0aa803f

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