Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d7b5da3b11c5311…

MALICIOUS

PDF

135.5 KB Created: 2021-07-19 19:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 51c7932d5be2400844a0dfde9e3442af SHA-1: 0613749eb13e4c6b1306cfd94126515b70f0252c SHA-256: 7d7b5da3b11c5311b13b1503163e9c1a7072e5f808291fd7fcde87581c92fc53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with ClamAV identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn--90aoj0agf7cq.xn--p1ai/uploads/files/jevumugiwutuwutar.pdf In PDF document text
    • http://poltinik.ru/userfiles/file/25240133206.pdfIn PDF document text
    • http://jimmartinfamilyreunion.com/clients/35696/File/15206346430.pdfIn PDF document text
    • http://lblussana.it/images/file/12715113117.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16085236b13388---resipovavefiranosiwi.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/07fb012a5ad032fc321864f0b02a3fd0/webelotiwagutalojibewigut.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/xesosemaxodinovejura.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/98063579655.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/ee6d13ba7b1596a2c362d5a1b6fae629/gejaba.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/44681063199.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/2df83c88c78321814f57d934ea5fd7ee/51243000351.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/lopitetufor.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/26756724367.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/jiwowaru.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/xalevabumigesatipimenuso.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2940c4e1bb---boretejifabedewo.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093d446a8d93---79174890569.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/kamodemidumi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ee215850dc0761000b9d5179fe41fb40/90884180308.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809b218e8aa---46081825800.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/53b7e021900b523194e3ae1605a12a8e/kakiwoxexizelin.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/eebb305298d1cd2877c1b211d860c715/sanunuwa.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcd0e653ca---56703534057.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16086c553402dd---30375950628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=example+of+altruism+in+psychologyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19869 18336 bytes
SHA-256: 5b50f1a588978452f74d6043f3f4792f7a8c22d516e795be1326c6827763cab6
font_01_sfnt_off0001c7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C7E2 16452 bytes
SHA-256: 29f07e28e07b31d07e51fca9fa36cea793036796d914dcd9f23640bca5da5948
font_02_sfnt_off0001dea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DEA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001f6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F6B8 11224 bytes
SHA-256: 008c77f0f5f8b331b55cd4291cfaaf58fc0ad1495715b9379fad4e2129c5262a

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