Malicious PDF — malware analysis report

Static analysis result for SHA-256 82799d95715579ba…

MALICIOUS

PDF

80.6 KB Created: 2021-08-17 16:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: beb9f7166443ec126ffd45dbf52c8ff3 SHA-1: 1abcc63f7bdea9ebcf7446715e8dc95d792b07bb SHA-256: 82799d95715579baa17f64f4f6c0a40568b022340acd0c08a5c5f2f371d7fe69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs and link farms hosted on compromised WordPress sites suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=ib+history+hl+paper+2+rubric PDF link annotation
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f91b2d9da9---38173333386.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/27359945042.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/49076861717.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ff577aa05---kifufilijujejajesu.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/waniburorujuwo.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/5096063219.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fc431a1dd7a---36115305667.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/34858290237.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cee9c07bb32---27164492434.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/adf04e14212a6caa5b74bff3a49b39b6/wulemoborapabejudeninowum.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/veregowuzulan.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a78667061f4---rirenixewugavetabez.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/93805774087.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/xutumevinodopi.pdfIn PDF document text
    • https://nexusmediation.nl/files/44355134766.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/ebff7b91ce29c3c27c38cd231c09ec4d/13464467320.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/908cc6726beb48fa408a8b87531ab61a/mufafejotizaw.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/76844782233.pdfIn PDF document text
    • http://livilgirls.com/files/durewomajarobufajogo.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/95470003439.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b678b92ea---mimonovix.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/b869e2bf7a20adde3a5eff57d1a5c398/299616610.pdfIn PDF document text
    • https://patc.fr/imagesfile/45721533127.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_off0000d903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD903 16524 bytes
SHA-256: 13ec8d59b44f9eda4d6d429dffc74541da8ce6105597ca123fb65afa11854e67
font_01_sfnt_off000103df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DF 10792 bytes
SHA-256: b20f8dec62caacf2c8911c5bf22189e3a4949917ab3dfeaf1ea7fc35c95ef9bc
font_02_sfnt_off00011cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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