Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef28d98bcd27226…

MALICIOUS

PDF

97.3 KB Created: 2021-09-01 02:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 95c057a24e807565964c7f79af293618 SHA-1: 82f003fb838a83d35a580b9f57fea94a5db253f5 SHA-256: 4ef28d98bcd2722648e4db7c0ae951ba6f3fb17731c539c326f2edda334b0c52
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, potentially leading to compromised websites or phishing lures. Specifically, the 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick the user into installing a browser extension or update, a common method for credential theft or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • 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.
  • 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://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/54h3v60gmhjprjstck9uekbdc6/60531633785.pdf In PDF document text
    • http://aytekinpolatel.com/image/files/34573458411.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/batibe.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/43285839039.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607976fdbb680---voxazivibagel.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/59887957433.pdfIn PDF document text
    • https://tepihtrava.rs//files/zekepetotowixokakirusijow.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/blncv45hul81a1h7efta8gemf9/zuderaperugazoxoxokimete.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/6565571999.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/69090392913.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/25796484761.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe60c1f559---84021422679.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/wapirawazepalugoxo.pdfIn PDF document text
    • http://dgjst.com/upfile/file/41105016568.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d6295cb2685---43834295144.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/2a2aa8d50b7c8368e1bafc868450471d/18871055367.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6622352d1---6171983523.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/280604266549.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/gadekimidagexel.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/45347181060.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b25e937fa28---22650754808.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df28394404e---zuvisijopolas.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/85355812218.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/75504051335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=cracking+the+coding+interview+book+pdfPDF 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_off0001165d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165D 11100 bytes
SHA-256: 092e00b2dff658848f4c06e69747d687763261a54ffeea54727a9fccc1b5bb45
font_01_sfnt_off00012fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147EA 17932 bytes
SHA-256: a281c6d544477f8e7e8753de36c32a081027ae3ba72004893f570c8a21457acf

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