Malicious PDF — malware analysis report

Static analysis result for SHA-256 aacb1a2b1a8bad17…

MALICIOUS

PDF

94.5 KB Created: 2021-06-26 00:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 58b528e7d5f3a4dccc72ab9f754a2a2d SHA-1: 783ae4438451aa19c782bf722cb2210d9b0e43f5 SHA-256: aacb1a2b1a8bad170469a3696c858c0f7bcf2860cc36cb4d554e3275700bdc28
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for distributing malicious content. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the link farm and the lure text point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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://travelworld.ro/userfiles/file/talakami.pdf In PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5b2907c35---gurabodewadexuxo.pdfIn PDF document text
    • http://terlickodds.cz/www/www/fckphotos/file/tasupevotag.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c48ebde4b---57219230086.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/49305884290.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/voteduziziro.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73fda08ba---pilejogubaz.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/6n2fbpmvt06hjack7desjpqh0e/kamafawalitaxages.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/db55e92407944730d2ef47bd47932391/zesanapu.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a402ac069c1ae2492fcbf7b185b2cd5b/53369383485.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e85bec052---bufagefo.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/tuzelud.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/448b8fa9d65f637987985ad97e7ce999/942281545.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef3fd3654a---wilutobagelimona.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/012a8259e75e0448e488b5c1c996f4c1/posipekuviwugewajinol.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/12156372951.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/11efb076580d327a6dfbcc1162783eba/34639113780.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c9156d21c---65173240060.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/bones.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088940c56227---mukanorotimu.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/26a5aa4af88f776659d0904146176fd7/kofasosexuderego.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/94809011294.pdfIn PDF document text
    • https://tycoonmarine.com/userfiles/files/diwakesamune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=hillsong+there+is+more+album+zip+downloadPDF 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_off00010af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001230d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230D 11216 bytes
SHA-256: 7b31ffb9cea66f89d704b8f1d2a2849bf696fbc47dbfc4d239e94ea0f39266c4
font_02_sfnt_off00013cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB7 17644 bytes
SHA-256: 8d484476f969fe2b9462c4b4b518ce291e2b9c9ac66454a81fa98a9aa431394c

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