Malicious PDF — malware analysis report

Static analysis result for SHA-256 6243c844f1b52886…

MALICIOUS

PDF

76.4 KB Created: 2021-09-20 08:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f7b5b87ccd5b57bf74bd4fb819546c41 SHA-1: f37ea1c76447321e4372632af31eee61b53ca70f SHA-256: 6243c844f1b5288677f6a3665bceb22a1a889ffc371886e236a34f7e7cb6b21c
176 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings clearly point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://ozsersogutma.com/upload/files/21377913671.pdf In PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-7/20210907221503700053.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/72382447276.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/sabuxa.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/wivimowowemulatuwunipap.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/katazumolalowok.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/begewokafoletuwom.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/72134017102.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/lobamazitosepulekozipov.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/46334967064.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/bukurozawamopibobodunow.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613dadd3cbb4f---20035628736.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/12904332811.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/35930639726.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece6a4d525---bajetaz.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/dufabilarigemutowa.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/56123185116.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/voberat.pdfPDF link annotation
    • http://bestbuyfromindia.com/userfiles/file/30222230878.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/41856223147.pdfIn PDF document text
    • http://punaide.com/userfiles/files/nigolux.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/zonatidotame.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-05/5fbf8ace3443c4f91c93946ed37b3178.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/16963959914.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/damowozopofep.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/53422476969.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/januvenisonokim.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/85b3c612cd31c00e3ee8cb9a70e18636/42324812324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=pokemon+go+apk+mod+2020PDF 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_off0000c5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE06 17772 bytes
SHA-256: 2c9cf70a832cf8a83d7b528da661271ec7cec81ae94064ce0cf44f4357f74053
font_02_sfnt_off00010c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C29 10568 bytes
SHA-256: 245be8e58997c4b8a822ccaaca71ceafa66b98ca0d9297014a0215c2b2935100