Malicious PDF — malware analysis report

Static analysis result for SHA-256 06b6ae52c3229a75…

MALICIOUS

PDF

78.0 KB Created: 2021-07-04 01:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1bb7e81577e61fb80fdb9ae08a2cdc22 SHA-1: d2edb1d3a9c42a91ac09a361d9d3de5e27daec7f SHA-256: 06b6ae52c3229a7515bb76f5e720e4ad74f000ce00cb646a88ff83013920f16a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URI indicators and link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://medvor.ru/uplcv?utm_term=what+is+legal+is+not+necessarily+moral PDF link annotation
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0df7e7bc6a---xuxavigik.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160840c83c3c46---46045817127.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/gegabibuviriloguvuzadoli.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/ohd7dkuoihtd4fep144tgpeac4/mitakeve.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3ce0b0be2---ginomisafa.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/24142451795.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/3ae04069f5787450efee82f0416f973d/kobiritupo.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077c0df52003---zipegonumox.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/44160951035.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082ee7e612c5---57116257499.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/1g5u3nberoe0hin886r32b0vrn/sukimovugitodi.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/visusaxusogivotu.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/0e1c01738c7a4d59916afdf3dda87396/61727976448.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/50512469091.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec83eb814c---72436179204.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/d3b563dafbe154f8b39f0cdaa56bc0e4/tazedixi.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa0655eb99---94800191394.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/11419393687.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c573e64170---12528589339.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a77c4a0a1---93072251836.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab479d9e677---xuxonituxuwopikerunipu.pdfIn PDF document text
    • http://teraval.cz/res/file/63118807466.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607586073dda2---tazutipajasafazubagu.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/446950da7f262b2dfccceee03e4737b4/44418514492.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160745a16cd165---45446070135.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_off0000ce9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9E 16572 bytes
SHA-256: 63e0b0c1f0f3c4dd75e2e2083b0ccc1155ac9c19194aef519f95b48cdc93eb0f
font_01_sfnt_off0000f9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 10784 bytes
SHA-256: cf38d673e3409cff9040ae1bce4b9c27b9f8dbd5fd84183f3a90962bd844794c
font_02_sfnt_off00011258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1