Malicious PDF — malware analysis report

Static analysis result for SHA-256 2812f99d18dc2a0c…

MALICIOUS

PDF

85.6 KB Created: 2021-09-17 11:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7159197b3ec7bb81665436ac833f2536 SHA-1: f195d1cc90164a801a3db7d933b079b2466fc231 SHA-256: 2812f99d18dc2a0c76eb98d976f1f3fcf6939d26dd0132b67a5bcd04e77ac826
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332e7ad08b9---baxipewezijeluvudabuzivox.pdf In PDF document text
    • http://artwatch.ru/userfiles/file/73542538326.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/8168131958.pdfIn PDF document text
    • http://artospace.com/pics/file/zizososug.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/27532404917.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/jegusisiselosewuvidem.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/liwanegomexitumenitolijo.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7e398f239---pexodazafasosivarobezezib.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/63747394551.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/67886038610.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/4d6b55edec732612804bf6ad3e6d6e7f/bojasagapapivutiw.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/lumitusewajajowu.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/80129399528.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/logefenirekoborux.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b92f199824---36835325425.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/48230134359.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/68764540428.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/47559169998.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/40382796641.pdfIn PDF document text
    • https://noventa.cz/media/files/file/57236639653.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/xukegomirebojevedav.pdfIn PDF document text
    • https://betsin.org/userfiles/files/69343961389.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/49663896395.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210903105650_MTg0MDQ4NTYxMDg=.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/18964935934.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/maduvorujovadezajepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=android+phone+command+promptPDF 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_off0000ea80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10292 17696 bytes
SHA-256: 5b6901ac00ef36e88788697e0a6899df855c07350ab51a0a2235ed1019f130e3
font_02_sfnt_off000130eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EB 10544 bytes
SHA-256: 7aad8759498add30cd0779a5db90a5dd58fa75ae09d7178a8dcf1511002596be

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