Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a7c92b9f0d2426…

MALICIOUS

PDF

88.3 KB Created: 2021-07-13 07:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 91a9acb8ab6f9236e5b134848b1e53b9 SHA-1: 9ae2ee153e98056c4effd07b2780f2d049d80b97 SHA-256: 18a7c92b9f0d242607e1c9faa69c363323a9756d5814508215ff988a02eea955
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a likely phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://queure.ru/uplcv?utm_term=best+soft+boiled+eggs+time PDF link annotation
    • https://lotteppta.com/beta/assets/file/furabe.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tewegikepuzene.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/27209284587.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/84711168382.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/9b2ab74ea07f432bc23d6f89eec8fdaf/11712344807.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/86296523755.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/laziwe.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608544b2ca36f---32421608248.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/49844945d15c34cf1aaaa1d029be7dd3/gisokeranedodebutimutezoz.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/wirunarumexujonikik.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be1474d9920---dunegarer.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/96045882331.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210615_074A42A12CA05A1B.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/kukeraw.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/molomesejinidavolupinati.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/derumipumiwomunolemisa.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/8955b84401a00d50119253a8827a0001/bifulosusotozim.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/6440f1bdb6308eacb01b085ebefb9205/powixuv.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/22702942311.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/forimatonixuv.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087edc1923ac---84373105426.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a441258e24e---36321728993.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608019820f5af---kanixit.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdeac18d53---84705086168.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/52266ce7aec5e426aed75a3307082817/48351674816.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607256dbaa4c1---73461825909.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/pakawurosu.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_off0000f97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11196 10524 bytes
SHA-256: 5fd8716b5bf57c21b532cfaa67e75cc1bc13d6afa8ded7781fc753e32f67226e
font_02_sfnt_off0001295b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295B 16420 bytes
SHA-256: 1f33f7fb6b1ec2b589a55688c497a25f46d1379fd14e10778b1b6cbff4e04e0b

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