Malicious PDF — malware analysis report

Static analysis result for SHA-256 d12bb602bd1ab6ba…

MALICIOUS

PDF

85.9 KB Created: 2021-07-29 19:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1d315f283bcc5ba91eded52bcf24586a SHA-1: b4fd4c12a89145a3fb15f9e8eb2a1caa81f3e008 SHA-256: d12bb602bd1ab6bad9fbee06a0072d0696e0c8cbe47ff90e680b2bbb181a0d35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to various domains, many of which are hosted on disposable infrastructure or compromised CMS uploads, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://writtenmail.com/upload_images/file/14861663410.pdf In PDF document text
    • https://patc.fr/imagesfile/38722937830.pdfIn PDF document text
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/piwazivozepufojigapar.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/j2m45frnsap3lba05tot4fdpd2/genimedogekiluja.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160d63448c1040---fuzosimep.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/38391126585.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/9f61055e40dc32e3c5d72c27bad54c87/pabasepevej.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/39081577227.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/jitetif.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/9ff6387489d6c42ea211d86215adaccd/nagovisowexuwijatuvu.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1dbf63c8f---48112475922.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095cc83adc50---27698981950.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/75506718433.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/14247393055.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/72a6888a029cc2acc5e7fda4c5bfb57f/xepituwuputejakixeno.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/kabikudek.pdfIn PDF document text
    • http://lactopad.com/uploads/files/febesodebugenoragisifukab.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb69fb89cf---ripukonoruw.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/mosemofilejogonorajuzi.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/talusi.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/luton.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e54204c4f9f---94217119586.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/2543cbfbdb0d9ba3a06de45f4fbc23b8/femavuxi.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/zibojawumado.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/052df9c30dc489aacbbc579cb42f1964/19584652608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+rehab+a+wristPDF 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_off0000ee95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE95 10272 bytes
SHA-256: 97aba75b667087c5af252cc4cc89850b22b5d7415f6ce814a8a805b046a6b72f
font_01_sfnt_off000105e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF3 16712 bytes
SHA-256: d2b725027107394947d19329126555d5dd8daca298f7fce402a12e783e48b18b