Malicious PDF — malware analysis report

Static analysis result for SHA-256 fecd868dc06a9167…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 18:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1618880387a024b1626b4b67f7bb25c4 SHA-1: ae8e248e2912c3df3cbffb49bf53b4f4a82924c7 SHA-256: fecd868dc06a916748f91236c37b833bbce99d2af2e5fccf2362715dfba51f22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV both flagged this PDF as malicious, with ClamAV identifying it as a phishing trojan. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/3p3cqd5tvq8vdtqt40nss7pakb/fagabimirudogu.pdf In PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/429ccca953908ea895b6857e0a39ebcf/91721905494.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/wakasezipatonelamibo.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210822_091138.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/grn55tsemtgrfu4dok9rfh71pv/mularotumuwijoma.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-7-12/20210712213423940786.pdfIn PDF document text
    • http://machin.kr/userData/board/file/kegenenenanitowelo.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073df80aaffb---8651658282.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/vesenonotuluvakone.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/567ca2a9a2f8ff9f72314892b2dfeddd/95772241943.pdfIn PDF document text
    • http://laduses.nl/image/file/jizikovomogix.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/kaxudiwujixemow.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/v0agmp2a7qne1cbn5dblpf37ct/pazesakamok.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/22292614193.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9345601aee---zupimobevagulubagadabivi.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/88750974.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/vosane.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/14251244772.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/lokumajevubiduji.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/bakokovuzanek.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/34eb3a7a12d629ba666bb2848d0f1ea5/46188038227.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/kasafikeloraxadi.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4372225b4---30205798735.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c96a7e8494e---48801631757.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/lazawapuxeduvapasesezeges.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=differentiation+class+12+solutionsPDF 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_off0000dd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD99 10600 bytes
SHA-256: 751deefddba1ee66d4438314eb0183f8a106b55544a846d9abde38d162d074e8
font_01_sfnt_off0000f611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF611 17204 bytes
SHA-256: f49ea1e869b629ff6d9e3815e66d921ef6e519c479a42a3f5c365b5aa243feb8
font_02_sfnt_off000121b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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