Malicious PDF — malware analysis report

Static analysis result for SHA-256 103299f1e712ff1c…

MALICIOUS

PDF

84.3 KB Created: 2021-09-23 11:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a65b5f75866a596d8c5081a73b9cda9d SHA-1: b0a0b0b793eab59bfdb1f54f456e93b768a67fb4 SHA-256: 103299f1e712ff1cdb8570dab78eda396f1817fe4851ca193e84a89089ddfc10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised or disposable domains, suggesting a phishing or SEO manipulation scheme. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://fzclicks.com/demo/files/editor/file/kojejerafewegizu.pdf In PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/vaxaremesenobekew.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/pelawamotaw.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/74812688980.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/a960849701f29cb1284c1409b13aca58/97429648418.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141d15541d93---tofupinigavapafud.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/87825704178.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/zezebojamodetoduxewiwo.pdfIn PDF document text
    • http://contelex.it/userfiles/files/nasex.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/24567847472.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/metimaxunezogar.pdfIn PDF document text
    • http://skia22.ru/pic/file/badosowagozufagemowe.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/wofeferuvagimapemozowu.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a50a0b4dd---pagugopifuxemik.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/65829187266.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109031838367064.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/xupawajoxa.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/kojapilagutoweromus.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/43137786036.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/jesoropogunus.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/6507373439.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/2696973336.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/5dbd6c623df58431b8efa6e9bdd9351a/roxufoninovoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=geometry+dash+mod+unlimited+everythingPDF 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_off0000e6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F3 11012 bytes
SHA-256: 7e7f97838f9b5eab058f3840e05dd3ea60d8066148a6382c651251a2f5f9cd43
font_01_sfnt_off00010038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10038 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001184a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184A 16832 bytes
SHA-256: ce4e6086613c70ec97369beff2f160c8b4a1f475581232bb87b9b619bd834acb

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