Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f4890220ae0be1…

MALICIOUS

PDF

71.4 KB Created: 2021-06-26 06:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ed15a0119ebea21d859ea4b98bb63a45 SHA-1: fcff67d31db0b2a9f9621f6c78309b9b4ae55187 SHA-256: 53f4890220ae0be1cc87aace222bf4db0dfedfe9367c82e04768b07b305c7ea8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's designed to exploit user interaction to lead them to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=dire+straits+why+worry PDF link annotation
    • http://bygreenpure.com/userfiles/file/61698717665.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/1027399385.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a0288312a40---dagosexunodadurafizefawi.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f765750ee6572b9fb512ccd542deecb6/lekapabejodujibiroman.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c309aa89a14---12376589118.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc4851c8c0---jidagupo.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/3109333422824b8f6b2fe855c28b8ff6/wiluwewuruluk.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/gobojunoz.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc9f90907b---fomovupevajolunu.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/viviniletafe.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607de8a7977fc---94607040881.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160744c0ac4314---96473693073.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f05e6ec379---35037405648.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/vi387hsqimsmis96j2hju6k9se/miritalemiki.pdfIn PDF document text
    • http://allasclub.com/campannas/file/60154822730.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160788d0fb03a1---palaxodizos.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7794457312---95905655960.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/56e8535d6a27c7c453017caac33ba21c/45216305242.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160955fbbf20e5---60841376172.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/73508b43c166915d67d3c76084b68e32/91500613761.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb729b2656---tanexivorulumalopixup.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/jinugo.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/onu1cn8n3tgv3f2sr4bm5rktg8/gumewologopawu.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/ru2uentrkr5k7dco8oogvjbqcd/tusafuxaperisofemomek.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_off0000b9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B1 10256 bytes
SHA-256: 6ad3fd30b105f3e1616f926d4ecbdfceb77cd178e2c7b820462aa419b542f517
font_01_sfnt_off0000d106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD106 15532 bytes
SHA-256: 00691f9d348791ce83fe10fa4aa0a60ca190f06e70491679965e3ac0e1671d97
font_02_sfnt_off0000f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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