Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc762b96f86b285d…

MALICIOUS

PDF

69.4 KB Created: 2021-09-12 07:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2fd22c9368245ba628a0579bb2d90b8a SHA-1: 4b88112edd57a665cce7e006f9039e87339c875b SHA-256: cc762b96f86b285d83a7d597d3119739e68e1d3097d8454376149eff75dd1784
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links pointing to compromised websites and disposable hosting, characteristic of a link farm used to distribute malicious content or phish for credentials. No scripts were extracted, but the structure and URL analysis strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://devitohomesorlando.com/userfiles/files/nufiwabamorom.pdf In PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2e9037f71---59536315001.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/mokopupotojovezipikig.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/m77k20mkrnvbcnsdnd8gnk0jec/vogadosu.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/xesenejifizotukupovenunar.pdfIn PDF document text
    • http://landpas.pl/upload/file/85910021393.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/gidofanabebipu.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613399ba0b54c---rosunajilaxalorozinoru.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/jadeguwavifenejakivinubo.pdfIn PDF document text
    • http://tdbm.vn/upload/files/61496593465.pdfIn PDF document text
    • http://home-plast.ru/foto/files/4365264402.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/fewezaxexojaragif.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/22919254533.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/96962742849.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/43602913445.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/50031155840.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/roranevova.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384613514e4---balekixuw.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136acf61a0fe---23996630679.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/wasofegutuxebofagelezeka.pdfIn PDF document text
    • http://raczcsalad.hu/files/90112195038.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161351e804a32c---siriwo.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/zisobasesabiwupina.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/vijulowa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=coin+spin+hackPDF 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_off0000b39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39D 10220 bytes
SHA-256: d591432324c44ce91d0e5fbc40d9335c6275c99f281208efff7f6f37e57f1ce9
font_01_sfnt_off0000ca78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA78 15128 bytes
SHA-256: 0088873c662be54b0809c13fecef3de4a908206afae45d2ff1705d84d8d7d35e
font_02_sfnt_off0000f08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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