Malicious PDF — malware analysis report

Static analysis result for SHA-256 85cd240e2d65b172…

MALICIOUS

PDF

88.6 KB Created: 2021-09-17 10:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b587a408383a14cecfaeced3a3b22d24 SHA-1: 8769f1e5e06ad3bff994eb3958ebb3d99f634606 SHA-256: 85cd240e2d65b1728d818761bc6f6c78ebd9897539b29b234c1966220274d146
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable or compromised domains, indicating a phishing or malware distribution attempt. The embedded JavaScript stream, though not directly analyzed for specific actions, likely contributes to the malicious functionality by redirecting users to these external sites. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=amplitube+ua+apk PDF link annotation
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/xijepuwejijixekoxejid.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/93801253295.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/75989065956.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f35f999c56---33858284660.pdfIn PDF document text
    • http://vhshf.de/File/58573236597.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/durubobo.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/52328834115.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/54671770300.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/61779127413.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/xulukizarajuwozova.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210913183400.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/44773640389.pdfIn PDF document text
    • https://tekmaker.com/upload/files/wokisamitarirubigodamepi.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/tenodivevafanepafepup.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/8347261696.pdfIn PDF document text
    • http://mutitar.com/user_img/files/64548402177.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/26201236579.pdfIn PDF document text
    • http://innotack.com/userfiles/files/woxere.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/8554980805.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16133e56dc5738---dodupinujumato.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/54066690502.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/54814023946.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614429c708b26---wodiradusurapasa.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_off0000f545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D57 18768 bytes
SHA-256: ad59b46a220c6e0063ff3386a4069ad65b8c71467abc32129899ba965aebc6aa
font_02_sfnt_off00013e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1A 10232 bytes
SHA-256: e9480f9e6f43ccfb48b71c68904a5b4fb622603f5a446dcfbd62ec53093e7644

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