Malicious PDF — malware analysis report

Static analysis result for SHA-256 f47ae8d46f6f899b…

MALICIOUS

PDF

88.8 KB Created: 2021-07-17 06:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 94bf986e30214f1de1a71a191c5f91f3 SHA-1: 021455fa9227bf7375721612fda80f84fd9c07cb SHA-256: f47ae8d46f6f899b9bdb4ca651a761f44bcbed26aaf2a504a80892fc20c85093
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm with numerous external URLs, many hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://sns.hu/_user/file/38701528239.pdf In PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/srajduaoqkkj7deb5mjdmq8c81/98295176621.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/sofazumexeribugagemigan.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/90868499230.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/sazomagex.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/601e45c214968ade7b41e6bce08a374d/92721639722.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc3bc27f67---83505580674.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/c8f9744ce327690226ff28298b8907ac/36939282823.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/dodasa.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210603_E2C9588B0E0FFF23.pdfIn PDF document text
    • http://rubensova16.cz/files/file/nowazesusafukobezoninar.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b366aa28043ec71798b4a6f2840557d0/xinitewifaparabuwejelidam.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/39288457221.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/jedet.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/11477d88b7146d127573a69dd1bc6a8b/xaluxadomumup.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/13849352220.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/05edc018a673a0276f40ab8729e0d8ae/mokupujipozaxotijer.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/xaruwa.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/15212268900.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/q9c710ak950dcl2qq9giko4o16/duxafuluzowo.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/4568224867501a64e62e95125f0b7f1c/visiwivarapadoriwozixu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/7nl03r5vdpja3mu1tdblr033r9/jilusodozetinekakijatusig.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/31093801937.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/76046377114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=big+toe+knuckle+swollen+and+painfulPDF link annotation
    • 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_off0000f8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F1 11024 bytes
SHA-256: 454683d675140b8dacc3294070d18675e2ab0fc415f1eaf8400514222a6f7653
font_01_sfnt_off0001129f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129F 16452 bytes
SHA-256: a6f252a7670f07da82ec45df0f2dbebdd06268acdbbcc52c6329d0159691f502
font_02_sfnt_off00013d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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