Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6504b45b50e16d2…

MALICIOUS

PDF

79.2 KB Created: 2021-08-19 05:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e91601a383cfbee0aded9c5c3692ae1d SHA-1: d866d04c1e1b7dc889e5042cbf20e41eca30515e SHA-256: f6504b45b50e16d2eafb20d9faba3973b0fed3135007a8d6bc785990fe14a3e6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The presence of numerous URLs, including those with UTM parameters, suggests an attempt to drive traffic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://irlanc.ru/uplcv?utm_term=percy+jackson+and+the+olympians+books+online PDF link annotation
    • http://cambridgekapurthala.com/damana/userfiles/file/pevozakejubuwepe.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/09d09237ce130d812ff9f5f5e016db58/wejujijozunixos.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/xuravimo.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7335ec7db9---tiginabexajawow.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/441pp430hbc8dpujiipqpeffm0/44979486972.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070064c12933---wotogezaremikafenotid.pdfIn PDF document text
    • https://schmitz.cz/res/file/jarinefilipeguxuwemomijom.pdfIn PDF document text
    • https://jetaime-shop.com/files/80361634936.pdfIn PDF document text
    • http://markone-tools.com/upload/files/pamupijuz.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/39806735664.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5cf7dcb49---77084291934.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/59be4c1d54188b12cf2443b1c4ed6892/mutoxibujilepukef.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/nm6d7131em4c1vdl8qhv63st1k/refaxamomugu.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759b6176d70---lusugizifenilonevukatilam.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ic39mr3u4640ndhaqb5tb9763p/30816748331.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/t37rkui3g3ih59ujjatcm68i2q/22402159526.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/xabukipawetewexex.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/t4os15nu318ohgk6merqdulash/71246823567.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9699218d6---11087961819.pdfIn PDF document text
    • http://starrwindow.com/clients/863399/File/rusikekokerenizevomoxak.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/0e64a203566886568b1ddcc26848f3e2/8470158563.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/7205734650.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/lolariwisarage.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/xufov.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021051812204273499.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_off0000d19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19D 11256 bytes
SHA-256: 77027b165b96f51c54aef68d74e16e5c1abe2876786438707c25935f1c04cd67
font_01_sfnt_off0000eb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB91 16896 bytes
SHA-256: ab1557556cbba69fd02aee31fd3e72cba9830c0fbcf37d337d20ab857c6ffbce
font_02_sfnt_off00011725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11725 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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