Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f97d753e0ed8e58…

MALICIOUS

PDF

162.2 KB Created: 2021-08-07 18:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f22595f3315df5097eb121e5e9c46c4a SHA-1: 11c80fbff1bea65a6ec713b111273fbc447dc9b5 SHA-256: 8f97d753e0ed8e5893df1425c2a3895f5d00742d46af402c9d5855fe56a2335d
156 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is unreadable binary data, providing no direct content clues, but the overall structure and URL analysis point to a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://a1climbing.com/userfiles/files/memumenuruzejudalelavere.pdf In PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aba055b47f8---51228750376.pdfIn PDF document text
    • http://cosyromania.com/media/file/padofavuvoxi.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/c5qb0fc9or54npnlrsm8l1n034/miseneparivewak.pdfIn PDF document text
    • http://rainesclassof1980.com/clients/3/31/314d3ac3c31ee16cfc8f78d457af0ebc/File/natugirusupolabivi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883ded829d8---fezobup.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/49466135120.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/b82a8b3f7ffda5cb1fe55794ccd7eed4/97678392639.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ff8c0e1917e---7507140615.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/keu1nb4vni6j2rfmnk7saqfops/vabibalememikibagowu.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5df98e46b---63861839927.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/4e30a3806a76634e89904fd30bb938fc/5782681040.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/78217354857.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160adf036d3b8a---dumijoromikuzesumufed.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/1536d4522940a4f563c356fa5900a120/mawuseto.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/ea1c41fb0318d3ff6a8a0ffb5995f694/92839841587.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607720ee85e67---fowaruba.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/9101a056603b2a7f489fe517d9718482/zisedipe.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/domutepemeroz.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/7f431d0ba2a6888f3fca63c0965d5bb4/81230616067.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/54841491868.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-6-18/20210618192412388720.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/49210210884.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/locudq6rvacgtl05btf9r07777/41158557515.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cf3b52808---12574079277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=logo+quiz+level+17+answers+by+bubblePDF 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_off000216db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x216DB 10956 bytes
SHA-256: 4b8e4de959a51eb8917c1a61646f82e442f446aedfaee2cae7773d8ed0b1b599
font_01_sfnt_off0002303d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2303D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002484f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2484F 20432 bytes
SHA-256: 4942f2921aceb5fabb4f505139818cc9da3325c16ded83c2fd9e69461f376970