Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f18b2d2489b7cf…

MALICIOUS

PDF

83.1 KB Created: 2021-06-27 02:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f17b80deb61724f2a6fc82c87ae2aee3 SHA-1: c615a28dfbbaf760782f32d6ce03e100877e763f SHA-256: 38f18b2d2489b7cfb0177b71184e7229ae5d2ff4fbcbc84dd9a3970bfd766f2e
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to numerous external URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://guruamardaspublicschool.com/userfiles/files/mudorokenadakumure.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a623f56bcc9---xuvajefelumenoke.pdf
    • https://abofahed.com/userfiles/file/47192287428.pdf
    • http://sun-green.nl/ckfinder/userfiles/files/kodotedesoj.pdf
    • https://free-spirit-city.eu/uploads/wysiwyg/files/widugavanaxit.pdf
    • http://elesi.eu/fichiers/files/66403862581.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/97236e73ff6057db2f1797b01e144a28/35343486189.pdf
    • http://195exim.com/datas/files/67644949908.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/7b6672a24450877827b9b54b04d9367a/funabivonaxotaf.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2273a2296f---46331730888.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bc9f3e06c---41879432978.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd550402480---kovonivug.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b465e9b4e9f---75870270714.pdf
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/40517372794.pdf
    • http://doo-san.com/userfiles/file/20210608045955.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7de56d1c---dajod.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/9afe8851365ea19a0993f24437e25e67/nipinenozazatiwupoviselon.pdf
    • http://gpn1971.org/clients/a/a2/a25689677492d603657f1241a2a69ea8/File/pafanodikavatidetesuz.pdf
    • http://say-international.eu/userfiles/file/28425154484.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed570aa68a---sovepenujede.pdf
    • https://cardion.dk/gfx/fckimages/file/240471248.pdf
    • https://n-zvuk.ru/upload/file/99339499266.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5e7d96768---nazuvepitizebupugekadaziw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ap+bio+chapter+9+reading+guide+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3e6.bin
9bd201eadcbd261817fc732b7bac19e4dd493439338f4d9ea9c529862d952fa2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E6 16108 bytes
font_01_sfnt_off00010d31.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D31 16792 bytes
font_02_sfnt_off00012548.bin
ed92f37617c474cf906d686f0a2ac2e77824867570e2d10c4d3f98db1f16d2d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12548 11224 bytes