Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa32485beecf882…

MALICIOUS

PDF

80.5 KB Created: 2021-09-21 00:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aaf63649d79b075601e7fb305230e81a SHA-1: cf33933619e8eb2d54168b9d740ff8159bae7a35 SHA-256: 4fa32485beecf882466323b7ac958cd4b4ad8b2ed827bc981e07bcb9d8467fa2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. One URL, 'https://crysiq.ru/uplcv?utm_term=play+store+4.0+apk+download', indicates a lure related to downloading applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=play+store+4.0+apk+download PDF link annotation
    • http://brukikostka.pl/uploads/page/file/tomoka.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/f98a94677771445b1e4742cd61af0932/zetavoxulujurogek.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/88269909257.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631925395.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/68706396514.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/32060582845.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/92257681409.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/vesazubot.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161371eb8e4d16---51096576359.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/32812229850.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614029e7523ba---5582093031.pdfIn PDF document text
    • https://ka-base.no/images_students/files/begatufagi.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/tebud.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/dasukuba.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/61645513716.pdfIn PDF document text
    • http://centronegozi.com/public/78725185285.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140186c7cce0---17158735251.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/jinagudojagusugabol.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135037a73a23---dubaxesuxemamijekomalek.pdfIn PDF document text
    • http://samwha.com/upload/userfiles/file/3471607420.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/nidelobujupamelazeme.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/kuwofasewikikuzinab.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/26735186306.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/82497028551.pdfIn PDF document text
    • 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_off0000d5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE10 10852 bytes
SHA-256: 950a36193a3ced8198a3ac3df1e9442313d9a6a055b91514b5907e2c66190259
font_02_sfnt_off00010772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10772 17556 bytes
SHA-256: 34db09539dbc8b241411d4bdd74d584777d9209e3bcca92352418912f1ac4bc1

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