Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1dcecc83a42c410…

MALICIOUS

PDF

79.1 KB Created: 2021-09-24 09:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2e22204ce49812eb2bcfa0a1ef0cc2b5 SHA-1: 7069a4c653eec7f1b6b3a8fb6019c6fea1e22a9f SHA-256: a1dcecc83a42c41038e411113f27de898fe3bac0a638a517c09a807c75b6e6b7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The sample also includes numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4110

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://huntic.ru/uplcv?utm_term=acr+cube+call+recorder PDF link annotation
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16140749ba7520---pesewedokalawogenesaduzaz.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/fizaser.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613169b7ebaab---dovabiwixo.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/xabuguperasi.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/pukewaso.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/vudaluvi.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/59004750092.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/87175045279.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/6560357630.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/14486691742.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/gabines.pdfIn PDF document text
    • http://bebcardkw.com/ckeditor-ckfinder-integration/uploads/files/13102872086.pdfIn PDF document text
    • http://airfa.it/userfiles/file/sexidurizero.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/fabem.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210904113120.pdfIn PDF document text
    • http://falcon.dk/sites/default/files/webfm/papixi.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/wopunafuwokufo.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/d5968a0635f0734b830ffbd75b837492/kixanademovala.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb07b0ea56---mupewod.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/58444677750.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/74716156930.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/pogewitilibibarem.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/69846762434.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/nokijejaruzubesel.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/5902598105.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/81378394262.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/lurexatusavapewuzipitig.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/jekate.pdfIn 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_off0000dcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF508 10124 bytes
SHA-256: 4b44a978eafc01f716f71163177021ef4b41eedbd4a00e18b627e5a9d0503b47
font_02_sfnt_off00010bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB9 18516 bytes
SHA-256: eb5bafc27599ecfb507d242c2468224739da5bbc7455d59438dce5b9373acd7d

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