Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2dc2637848418c0…

MALICIOUS

PDF

80.1 KB Created: 2021-09-08 02:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4daf097e6fb1ac38190d6dc1c3cab432 SHA-1: c67462a88b787c446a146c21e45d7b796fd36c0a SHA-256: a2dc2637848418c0e0a6e5f22b487e00cbb1fb48298b6c92e554267f93548e20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. While no scripts were explicitly extracted, the nature of the link farm and the ML detection suggest an intent to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://handinhand-daycare.com/ckfinder/userfiles/files/zejegokimixib.pdf In PDF document text
    • https://guineaservicesproviders.com/gsp/files/77005333833.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210808065630.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3af7a1a963---vumijejedoborawipo.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/bizuk.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/javinowexa.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/gasupumoborofa.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/wukenuwilipiwinarupale.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/zuvasiwexi.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2737dcc2c32a88fecd34c61ce5c53ae3/pamefuvoba.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863a4638165---16745642272.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/4gjcp894hgqv71d0ei41upjte7/bavejodefeveteromisap.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a1bc03f04---98920983595.pdfIn PDF document text
    • http://vnplastic.net/upload/files/14919611801.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/628ahvf1akubvt6gm8n81udai4/wizejanetatulifisikak.pdfIn PDF document text
    • https://capecoralliving.com/media/file/22161310157.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072a2773b0b7---11389210035.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/36453290461.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210731_201858.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/gogilofopigoredoterus.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073dfa15493d---17898835574.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/nuvogug.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/19940340657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=bibliografia+tipo+apa+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_off0000d47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47E 17820 bytes
SHA-256: f00a2a24a7aa0333907e7ce3b92fbb2767d0a6a40efd364a314ab7552c27703e
font_01_sfnt_off00010380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10380 10464 bytes
SHA-256: e90a9050709349599421344674d102c34bb48689b97c91b4640253e7304235db
font_02_sfnt_off00011ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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