Malicious PDF — malware analysis report

Static analysis result for SHA-256 69cfee7537d1f7d3…

MALICIOUS

PDF

88.4 KB Created: 2021-09-05 21:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dc2a83b11a614d1028075f92912f5943 SHA-1: ca40046b5d6b207dc31125738cdad6fc6a69c054 SHA-256: 69cfee7537d1f7d3abbf4c9f79718bbe4cf65ddf5de61e094bdfb809592fe36f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16117cb6204801---39855923232.pdf In PDF document text
    • http://safedoorsystems.com/cmsimages/file/58959721853.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c927559764---98782453483.pdfIn PDF document text
    • http://hainfelderteich.at/kasevijikibuduxorer.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3caa89cd9---waxawozesolagukokixuzor.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/wesegimunativivimogadapom.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/e4f0be3342ae6cee27e829f28f0ab33e/84492039547.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/0f3d2205e4b99f3bc407aba1edbb4d75/13868431005.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/tefofipozefizu.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/baveruligaxu.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/fufamo.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/pajebigosipetobupakevu.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/98e0ca3bea6458d5ff6ca6e08af2d70f/fitikevililixutomuno.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/25193460389.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/dubotuju.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/43a3483229c77c4f02d6916a50a76446/53513959065.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/59002228606.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/pepesonajaxefasotuk.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/fifopafa.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/f0avn5qk7bbjru69atr6spfabf/55283411235.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/96701136256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=biblia+de+liderazgo+john+maxwell+pdf+gratisPDF 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_off0000eef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF2 19444 bytes
SHA-256: 513400e05de45eb4d967173df59fc26e6d26d8763efd74dbc5fe67d1bc429cdf
font_01_sfnt_off00012154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12154 11516 bytes
SHA-256: 807af4e73b0163626221c5755b21384fd0b4dc91761015709570427cf048fa44
font_02_sfnt_off00013c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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