Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8779dab75f9537a…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 08:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 54810e978b7367ce68e2b970095ad82e SHA-1: 9263c74982dc03909d0f00241751096606a46230 SHA-256: d8779dab75f9537a5ef1e352080af31ee76726e3fe74489c6fb6b781e65230b3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. ClamAV and ML classifiers strongly indicate malicious intent, classifying it as a phishing trojan. The primary attack pattern involves luring users to external sites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://anandalaya.in/resources/file/pufajabeno.pdf In PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebe6fc7b7d---voregirigisagev.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/23943582172.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/50401864789.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/betixifesajokesusepijetub.pdfIn PDF document text
    • http://vit-physio.de/file/janaz.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/godakawomevo.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/vemalafa.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e37b26d6d---98855057412.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/pumaviburijegujuterug.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/4234857623.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/zitodamo.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161445cfa837b1---75236418276.pdfIn PDF document text
    • http://vina2002.com/uploads/files/26568556272.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210919025500.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/69643991719.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/butijevedataxa.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/guraxezin.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/gakonudijepa.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/wemuf.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/tonunokaferewe.pdfIn PDF document text
    • http://capital96.com/userfiles/file/62787360931.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/jobuvopeporu.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/zukokumivikupalinej.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/sagikeselenabikuji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=braun+clarke+2006+thematic+analysisPDF 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_off0000e022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE022 11144 bytes
SHA-256: 97c6d63d6b60d66b40d46572094f1487115e98936360e707a8e74bdc102436c7
font_01_sfnt_off0000fa1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11230 17964 bytes
SHA-256: 85402a8ab6eed2ceaf1a407c8e4086cc16b608bc6874177f9097289c218e8f05

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