Malicious PDF — malware analysis report

Static analysis result for SHA-256 99dfa6b0ce7f4a22…

MALICIOUS

PDF

82.1 KB Created: 2021-09-13 19:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3d74452f4cd0946f0d02bfe9afccfd65 SHA-1: 73afd89084b5fdf321f1f2c709e8f5005e4e0b9e SHA-256: 99dfa6b0ce7f4a222b4013691463132db2f26e84306fe02faea5a5e67627bbc3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The document contains numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=cvc+words+beginning+with+y PDF link annotation
    • https://onwater.my/uploads/file/gekelamavixademije.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/35610491899.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135e6ac70653---bunaxidisafulapubevoja.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372dfa29d4c---lexubisojatomipijav.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/qjg3njedqvjf3mv9sd7r4h33tj/79065331420.pdfIn PDF document text
    • http://ibb-online.ru/f/file/51078192602.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210904_202248.pdfPDF link annotation
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/71828817991.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/niberekat.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/julaxokasewesakukuvawiv.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/6514015230.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/4597043454.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/57801069787.pdfIn PDF document text
    • https://foulardfotografando.it/file/31933126897.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109020437558617.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/nuxexugubugore.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/nuzuwuxukusifidu.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd2a41e966---21278662035.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/66140428588.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109010334063169.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/nixozimutevakevizaripiwim.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/71727557306.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/zelesibaloram.pdfIn PDF document text
    • http://pasted-radio.de/web/files/tizinujoxetugulaxuvabikus.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/tuxipirevoxojofipilul.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_off0000dbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB7 17604 bytes
SHA-256: 9778bc7eb902bb1ddcbc4c373c3a41df1be84a9cbf8f6235c95df4487bf44e90
font_01_sfnt_off0001095c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12173 10880 bytes
SHA-256: 27a9e4377d6086b29cc7a0cf8ab7658f91c363cef2a938e84f04c87cecf7b913