Malicious PDF — malware analysis report

Static analysis result for SHA-256 af69f33498b4e6ed…

MALICIOUS

PDF

90.1 KB Created: 2021-07-25 09:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7b02be8fca2a26d6a062b742b01e9c59 SHA-1: 13325b9d738aba8504f48ea12159dc55c4392e8c SHA-256: af69f33498b4e6ed249c9ccbcd904fdd3e009c5fa8830f610e9785c163499e1a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8b108ce04fecfe50539d3241b334a854/61351146086.pdf In PDF document text
    • http://biolabsrl.org/userfiles/files/11646844249.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/lideraliz.pdfIn PDF document text
    • http://fairmonteast1978.com/clients/71195/File/67298161509.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/fakibufel.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871d588a888---lutilazajinumiz.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982e176fad6---lulujewijevixudotunutir.pdfPDF link annotation
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/5819675ebfc3b757a8cb42f923a049b7/10225466371.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/95053288019.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/fisifulagediwuwejabab.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d7b30e6c8---23652756524.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/ropugafejukugufifedimakor.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/bs6iaf305f06icavesb4hcvlt4/55363408480.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/rutezekurolatulawis.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/qf2q63e6ck6jln6e95fhlbl60e/nasunujozerigokotumob.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/gulomiripizigukebi.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210510031636036.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/36976328315.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/9emncob5ooqqr85clurov8tal6/71291089499.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1077f2ee8b---gitufuwapobevawo.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/v5ghua85mbsf8eve0p1kgm2jk1/86565923291.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/0a7662ba3c3a124fe1b5f7f1f0b75480/nidakisoguvimanoda.pdfIn PDF document text
    • http://omg50yrs.com/clients/6/6d/6dc66c997efb3e4e8ce6e6e7d0694e91/File/99172111791.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/26391647585.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/55446965201.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/34277244816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=listado+de+palabras+para+jugar+pictionaryPDF 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_off0000f7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FF 11132 bytes
SHA-256: e25fb1fff126a4b109b6147db613849563d1a92aac4f6afd63f0ad29cee32046
font_01_sfnt_off000111a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B7 17852 bytes
SHA-256: 78fcbedbdd6736993c7e0e796272c196868f69c54b602f017617b33df9af1308

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