Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e1ef197baa62bd…

MALICIOUS

PDF

88.2 KB Created: 2021-08-18 13:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 376c5749a26ff3d1630765669654566c SHA-1: 00f8393d3e7cedab10ea20500ab7de6c12f75bb6 SHA-256: 25e1ef197baa62bd10437062d1385e2b6385786342cbbffffb5a6858ff049742
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple URLs pointing to compromised or disposable hosting, indicating a malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document is designed to trick the user into installing malicious software or extensions. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://web68s.com/upload/files/91480516758.pdf In PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/zeneferigurupewa.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/eb5a90ab9d1b7ada3e3e40dd17716100/90247838741.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090edfaaabf6---keravirizuvaxativos.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/jovogatobipajupixujagas.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/61561174830.pdfIn PDF document text
    • https://actorconseil.com/files/file/penegarakukogal.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/wunubezovomolavubitevime.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/27438980484.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/de6e23d5d0e7932140ef8a11cf40c2cc/tozukijirumajol.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/75632e0e4b9877ac3502290f6b75061d/semikuvezo.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161098d164b85e---9312501440.pdfIn PDF document text
    • http://vestmorecapital.com/images/epost/48921685841.pdfIn PDF document text
    • https://codecs.ro/images/file/94432678632.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/puxipefezoburu.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/8e55c8510186b99416a309d36e3721bd/36800392907.pdfIn PDF document text
    • http://learningkey.org/userfiles/sutofexulififunefinubem.pdfIn PDF document text
    • http://taiwangallant.com/uploads//files/202108050036493364.pdfIn PDF document text
    • http://melabo.com/upload/files/49714457959.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/e5c149a49792763d0e48625780629900/70069349495.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/kepik.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fd86f105d---62287251721.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/16903979555.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/76138966199.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/945e9a627308bdb48ba07f3e895094f2/99193565620.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/3452438478.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab0b43f31e---fuwudef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=super+smash+flash+2+mods+naruto+downloadPDF 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_off0000f058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF058 11052 bytes
SHA-256: 4aae315d310f4c6b70a1a6300939911c03c4f7acabb9c3608037d04cc78430e9
font_01_sfnt_off000109fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FB 19940 bytes
SHA-256: 4387fdef41fedad11445ccfda3d43ae99d2e01124be985b0923a8d8c945d0eaa
font_02_sfnt_off0001396b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1