Malicious PDF — malware analysis report

Static analysis result for SHA-256 423204eb32b0aa6b…

MALICIOUS

PDF

79.6 KB Created: 2021-09-05 12:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 48879507fe9a8cc9370517b16a3a0cd7 SHA-1: 11bce41e68c9fc66aa4d9aaa0c75d06b31992d70 SHA-256: 423204eb32b0aa6bea0c20213c5c683247555e4af31d8fb3ead533c8efa1916b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=rainforest+jumperoo+instruction+manual PDF link annotation
    • http://steinemann-ag.ru/sojuz.pdfIn PDF document text
    • https://kiptep.ru/file/zogogakedafefaledil.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/25201976439.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084e8c886d4a---97068895058.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/8544239528.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/45070537436.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/58e25b18cb8c2c031ec7c1285a8a2b41/70208100540.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/25146820223.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/731e5b9b9262d1631f142b7deff47010/95241218034.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075709ea77a1---fepogalu.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/iu7o9ft9hk4kbkh0jtfl81kaj4/wagunapegaxurawuderuxune.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160872de991e88---23171230086.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/rudixununaberoligodila.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-19/20210519010739143497.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/66717749923.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a1244e871---dakegoveta.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608eef17e870f---82286137864.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/27bc46bbb351368b59ee2056c62e93ec/bijelikimo.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/ms2q4bg83bpqa2js5qgcc86b9s/80712407370.pdfIn PDF document text
    • http://redsky.tv/userfiles/files/27783265294.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/tijowozarajajakik.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/rixixewukunes.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/bositenuvivonedojozi.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/3nnnl76co1ivqq6dakitnuls73/xadobudo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52C 10916 bytes
SHA-256: 7697b8b91e3eb3b9936908aa442e9b1efd9eb1d42553b482ebd2f51f87151d48
font_02_sfnt_off0000fe66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE66 19072 bytes
SHA-256: cdccac3de392981f82db041aaceba35840940e584d97aa5a999eebf8f2a96ce6

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