Malicious PDF — malware analysis report

Static analysis result for SHA-256 6313100c939b3c79…

MALICIOUS

PDF

77.7 KB Created: 2021-08-26 16:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b536fddeac4036ed2b08f16060e5eee4 SHA-1: 3bd0735ccbbf314a9e9e0e9af8448beb6a85336e SHA-256: 6313100c939b3c79a18dbe0ad34de6f41f907cc2dc4c78a126384f3ac35e1261
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a small PDF acting as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded JavaScript likely facilitates this redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sport-jicin.cz/dokumenty/jafefetezexosi.pdf In PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/gedumugutuxigoririfuxapo.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff43cd4015---jebidavudabavelaje.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/51477431999.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/mugezigemitesubadal.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/moloseberusanisi.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/metumeniv.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/mufeledov.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/zuwisifigonazikanulo.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/bavinegajatitenokuvi.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/c41d064827c34ba90e65fd5aff8a7a6c/42296755545.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/46314a3caf189c939853a0dbb126c0e6/79577183566.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/4d9f6e552539acd4c7476d9049e1e777/jejagoxozepa.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/73424079890.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/kixivoloket.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a009556b63b---31152250722.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/7uo0srtdidnhodc41lttcuqmur/kizozabutobarufa.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/d5e95b265eed38cffb1a9cc91f5ba119/18900100490.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/58940406658.pdfIn PDF document text
    • http://hodori247.com/uploads/files/32697226979.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/20270189560.pdfIn PDF document text
    • https://lasanisports.com/files/3407680127.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/98052fc778b29b7cd2d0632aa91bfd81/17387559329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=network+communication+servicesPDF 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_off0000cedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F6 10664 bytes
SHA-256: 41b32d4e8ff100018558cc6944b0db03c6294118e41ddb23a72bfc0a1b4d089c
font_02_sfnt_off0000ff7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7B 16028 bytes
SHA-256: 787e2785503749db5fc2787cf8c3cb19936e4f56908321049babf0b0f0b36378

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