Malicious PDF — malware analysis report

Static analysis result for SHA-256 da624cde1f04038f…

MALICIOUS

PDF

81.4 KB Created: 2021-09-02 17:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 001f0ebc89c2b9c412f0b8422f20a142 SHA-1: 0ceab543acb49f4af90f00903ab3fdf45db56d96 SHA-256: da624cde1f04038f976af16070e4594e9b50f9e901b330343c474e12ee7a75c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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, pointing to multiple compromised WordPress upload directories and disposable hosting domains. The embedded URLs suggest an attempt to direct users to external, potentially malicious, content.

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 http://meteosputnik.ru/userfiles/file/zawemeraxakavamuwexejezod.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/r35dvo7m7gjh7okk455av4sao5/92047842526.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/33d0d72636cd8be451e31ddff97f8bfb/zotogevetezikapedom.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd62f0db958---38770491596.pdf
    • https://www.ewdel.cz/ckfinder/userfiles/files/89585120227.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/kegoxejepeku.pdf
    • http://branpc.in/ckfinder/userfiles/files/lozopomazufiwazoroxum.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ac682f3f0f0---69047236842.pdf
    • http://botosani.ro/img/uploads/file/vamifamutokumu.pdf
    • http://petra-dario.info/upload/datoteke/16668921047.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/77da0d2d56bdfd03177287ff7b1401a2/22261324584.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1409ed943f---16634398621.pdf
    • http://zdrowejaja.com/Upload/file/xizujelerugukofonised.pdf
    • http://fittbike.hu/files/file/65403771309.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4119a1968d---17629880776.pdf
    • https://rasathantrananotech.com/ckfinder/userfiles/files/24383523660.pdf
    • http://valsadindustries.com/userfiles/file/siguzazadepoluv.pdf
    • http://mtecommerce.it/public/news/file/sotetekigabaselixenilenow.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088477621a39---39114891248.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/enamg9ug82ci90tqklprgbecek/18717663901.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803ee85269b---zosavov.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/8d8c79fa837e378e9d59304387b11fe1/kegija.pdf
    • http://drxzhang.com/userfiles/file/zefaxugakaloxugibo.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc89892a23a---finofo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=information+retrieval+definition+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d964.bin
820120f19532286712faedb65a6d5ff0822c2ad71b8c8e9fffe6718c2a01435c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD964 17888 bytes
font_01_sfnt_off000107cc.bin
0bd9a3306937fdb2fb61894c0a443d7953dfc4f62d3a03c0f304afb704c42bfa
pdf-font-stream PDF embedded font (sfnt) at offset 0x107CC 10508 bytes
font_02_sfnt_off00011fa8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA8 16792 bytes