Malicious PDF — malware analysis report

Static analysis result for SHA-256 3915bb2ce0089fb4…

MALICIOUS

PDF

82.7 KB Created: 2021-09-12 20:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cc8f2f1905ad2d6636a471ac8ffdb174 SHA-1: 66255d6e97c2c4b58932792453c80c8a3870b542 SHA-256: 3915bb2ce0089fb4b71d842ef9ce91755baf58b996ee0b6a12b836f2be3502d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest it's used as a lure, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://bipalisdemo.dashindonesia.com/userfiles/files/koposuwatofo.pdf In PDF document text
    • http://metalzilemboeventi.com/userfiles/files/torolaroxoluji.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/66111401911.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16136b341b0a45---10120393330.pdfIn PDF document text
    • https://sealskinz.ru/files/file/mabafixeduluvifugifaxeb.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/90115457900.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/virekufofenekolek.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xuvidepavekakajaguruxu.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/61490968498.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/89754221293.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210901220035.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/wirizokerogox.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/5c7bfadd855592f87481f9098cc0fbbd.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/tifidixi.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/f805f5d8fd05a7af312cb559d4879761/kelakeduwut.pdfIn PDF document text
    • http://yukamifashion.com/upload/files/jonavizu.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/24740307252.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/rajoxaketesi.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/71727086436.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/4f0580d57a29863be3a6af6f9bab1c90/94525641372.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/a29b1bbd4557d2fafbf4903100095c0b/73351084085.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/xabesumadux.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/xopuxokolonemex.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/4250729428.pdfIn PDF document text
    • http://zuche0551.com/upload/file/zexekimagojuganiwideli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=can+an+iphone+and+an+android+facetimePDF 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_off0000ddc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC0 10704 bytes
SHA-256: a723739486383aa688513afa8252b8c5836dfb2373e2980aefda6ec48d9a982d
font_01_sfnt_off0000f61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2E 17884 bytes
SHA-256: a493cf61bfb7c88058b59b553ea33278cc8e09f7511edf915f3b25f17bec945e

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