Malicious PDF — malware analysis report

Static analysis result for SHA-256 75576489b1beea3c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-13 22:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c03c50bcc083e4898108010b33385e6e SHA-1: e0748f081f58c9c0e87d6b557c495d549d544a39 SHA-256: 75576489b1beea3cddf1f77f09350e3389953de9043b91446a3755bab9a671fe
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://pistant.ru/uplcv?utm_term=how+to+free+up+system+space+on+android PDF link annotation
    • http://studiozoppini.com/userfiles/files/jatododorafamelara.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/52856568341.pdfIn PDF document text
    • https://senfina.top/uploads/files/22937310715.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/36713903968.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/19856765178.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/guzaxuzifofuxajar.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/xodegunubagenegidexevilaz.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/16350915145.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/dotebujofolof.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/vepabotikinovitanujilaz.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/39366468974.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff8d020a90---87956439278.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/54802753934.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ef7ff39d4---8002533315.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109041736356345.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fecea30d2c---jubelaguwalikupevasasopo.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/javib.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd51f9dc42---51618456958.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/giban.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/43907712801.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/c768817c1dc519e016e56dd3f7a1404f/82295196540.pdfIn PDF document text
    • https://kapefashion.com/files/files/rafulowisabupiworuve.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/19567649842.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/letotijoferugiz.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/14901932752.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/8fv16ffbgos00tgekdrkdvqtv5/61438905428.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/65675006930.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_off0000da5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5D 18148 bytes
SHA-256: 623fd91719b60b55faa7a4b2b7e66434ce9f6afe56e9e294b777275200009fe1
font_01_sfnt_off0001095b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095B 11024 bytes
SHA-256: e300de57ea9a3c418d00bdde8709446c48858b9515bdeab7f8cf480f9153eff7
font_02_sfnt_off0001230c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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