Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac3d4c5f45c5a2a…

MALICIOUS

PDF

84.3 KB Created: 2021-08-18 21:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8cda1d9ced2ab22344e0b4ad175ed35b SHA-1: 6a07e9564b00277e53716e63b29ba952d3f9c2d3 SHA-256: 9ac3d4c5f45c5a2a20f3621bb0a9c91d26c2c0f323a3b1047777aa35743796a9
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links to compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://triatlonbizuterie.cz/sites/default/files/file/5119432367.pdf In PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/9ec1b3352b752f4d6afbb3a9cdc36a2c/nitexilogivina.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/aaba8c279fa87c6a4d67386cd3226436/24761655632.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f7dce168938---vipasavawawupitizupi.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/72577250662.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/mfpc2t7aeil6uie5undn096kkq/wurumezugeduxaxe.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160987a503ff40---73702327186.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161152e96ab998---vowarawenovujufed.pdfIn PDF document text
    • http://dothanhigh1970.com/clients/6/63/63ba8bdc6fdca46b25bb56d5732eafc9/File/limirinipadofesowep.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/17466515640.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45cb52d733---73249259951.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/40808717520.pdfIn PDF document text
    • https://biomisszio.hu/tmp/40021421828.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/d898c6c991525e294a01b1c369bb22b2/xuroripezodogopadugavulo.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/57adf4e0cc0d1eb4d2f3a356470a04a0/43006557040.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/xakipiloluvifiregewidex.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/87642941115.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/lutivemixazoxube.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/wivelajosal.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/55567671272.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952d7be0fed---safite.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/bovezanone.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/75187000772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=geometry+construction+worksheet+10-2+answersPDF 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_off0000e33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33A 11208 bytes
SHA-256: 0db9703ab5fa711acbff0e555bba7e0b5f0a6d888b585504aa50a5c1b2eb6234
font_01_sfnt_off0000fd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD91 17032 bytes
SHA-256: 23067d88d650943fd53f50b271eacca9930adae6dc77438ae5143f9fecfcbeb4
font_02_sfnt_off000129ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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