Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f5078cfba32aa91…

MALICIOUS

PDF

87.7 KB Created: 2021-07-26 15:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 98b2e24009c7adb8fcd51326560df552 SHA-1: 8ae5acafec7e2c77bd3362bb3c5119d3ff65c59f SHA-256: 7f5078cfba32aa91a66b67754e5aff9e0e7fdaebb125038f5592e532b74c1e23
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'Browser extension / update installation lure' heuristic strongly suggests a social-engineering tactic to prompt the user to install potentially harmful software. While no scripts were directly extracted, the presence of numerous links to PDF files hosted on various domains, some of which appear to be compromised, points towards a distribution mechanism for further malicious content. The document's structure and embedded links are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://altonika.pro/files/fck/file/geweros.pdf In PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/16872971367.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7fa24c167---51199552536.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea8476b497---7979780406.pdfIn PDF document text
    • http://ca1970.com/clients/10044/File/96061630175.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/46e656fd432b42ec1ba4562fb437055b/37963784252.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/39551161661.pdfIn PDF document text
    • https://eurotechcorp.vn/admin/webroot/upload/image/files/86061919779.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/malaxufanipi.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/5c7792fcc6ea9eb886a296ff1819a9f8/49039164438.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/65835845178.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/caed11035d7604887ecdba1c17a919f0/31675745482.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54825244514.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/sorokemiwupora.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/c903a7e18f642724ed5df56ba71dd8d4/18545941306.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7d0de6d975---juronakosuzukifetupa.pdfIn PDF document text
    • http://sukhabalka.com/files/file/xezeke.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c949edceedb---27354447921.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/kitirolokijo.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/c20rgiju6ush7q57j887kiac61/78667724979.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/41ppan4b4j00tdbiipracjr5n3/45816179708.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/be880fe722e295a764b101ace60919fe/pewuliju.pdfIn PDF document text
    • http://maihome.hu/admin1/file/sakifif.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/9b547cf32bcadd9a3ec4d7119dc14804/85509801892.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ad68f15ab4a50f6e1d165a067c15d65/90806895620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+do+i+add+amazon+prime+to+my+twitchPDF 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_off0000f1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A9 17128 bytes
SHA-256: 72ea9a3f8d5e218c2fa4f40aeace55cd2b2036fce6601d9446cbda35acdb8787
font_01_sfnt_off00011e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2E 10816 bytes
SHA-256: f3c7e9f91a39fee5e2c2f1843292114117bcf448e0ea8213edeace216e130594
font_02_sfnt_off000136f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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