Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f5837811f2941c…

MALICIOUS

PDF

78.5 KB Created: 2021-09-14 02:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bf59ae124b2db96976df7b43894f89bd SHA-1: 16fd1dd7e648223ceb168a626b1d3e368504b3be SHA-256: 70f5837811f2941ce202ba1e826756dc3d7b3bc4f147cf82eaa03ec4c495448c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress upload storage and other disposable hosting sites, indicative of a link farm used for phishing or malware distribution. The presence of a 'callback phishing phone lure' heuristic further suggests a social engineering attempt. Although no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely related to distributing further payloads via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/9454753357.pdf In PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/7e7ac99b756d416ed9f269befb560087/tivenupexogomudilakox.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/faviwetixosifowedifabo.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/mokegujukipi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136f3e71db68---vuromagufolar.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/kikukafotajikosimoxinot.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/61135102272.pdfIn PDF document text
    • http://mobilenmr.com/files/files/toles.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/xafakakeg.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/difomesewamumofotowo.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/15911890891.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/67934893068.pdfIn PDF document text
    • http://oris-am.com/editor_up/33100700249.pdfIn PDF document text
    • http://parilka.by/var/upload/file/27346233940.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/fewixi.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/05a12a3a01929ab6056b81e0ff015bfa/kowowizotiwalefogudadovek.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/81427203166.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/janubigujalusoku.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/33896541014.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090816235166.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/72039701798.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/nuwudezok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=capcut+download+freePDF 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_off0000cf2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2E 17244 bytes
SHA-256: a37e3724d54fd17aa2753abd286e22bb6c40ec407456e32f0e79b760f977db8f
font_01_sfnt_off0000fc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7D 10572 bytes
SHA-256: 9c7baff719433a45954659c9e623335ca65434ab48c605cc2c7ce042078a878f
font_02_sfnt_off000114d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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