Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa42697cade42012…

MALICIOUS

PDF

78.8 KB Created: 2021-09-07 01:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6cf81e954431e19e30064b66c92f0f26 SHA-1: 6c545a12ccdaf4bd17ad38682aba152750b20327 SHA-256: aa42697cade42012bee76ca60dcdff1bda5cf6d3b43ccda1f56d8d19fb0aa7da
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nosepuxuloxupataruvijaroz.pdf In PDF document text
    • https://bamfieldrental.com/userfiles/file/80836316510.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/46348365755.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/44473706257.pdfIn PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/wajajaxuriwefazazan.pdfIn PDF document text
    • http://hobbes-group.com/upload/files/powomeforasubukivegi.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608227d759739---laluzonotawiwe.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/9de0bc2cd04208e9b2557d80706d5a4f/xivesak.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/58247910383.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210607052420_2114807800.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/97935204803.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/d4786e23b8f56ebfe06b00b3be94173c/lujojejinoxopusunugi.pdfIn PDF document text
    • https://immobilgold.com/file/8234658333.pdfIn PDF document text
    • https://lordoptika.hu/files/files/91104629382.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/zusofudijimur.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df5f34bd6d---wexanedivoxasavuxisixifo.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/19049527871.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/2c230a1bf5548bb29cbdc2a00b2fa8bd/mozawupidovitodum.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/qm2e6f7pkgsjapbifpgkfnn7mf/zajelizirebowikilafa.pdfIn PDF document text
    • http://contua.org/userfiles/file/94132374881.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/uu5j2ljraupgp6r24h89dp4r9r/dafubewedavazagigi.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0666045f9b---49918734582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+combine+pdf+files+in+adobe+acrobat+pro+dcPDF 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_off0000cf7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7D 17320 bytes
SHA-256: d692ee7bce7a460463fe2d92f8326d0fbd44fb25c3be1d1a00abddc864513c7e
font_01_sfnt_off0000fc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1F 10996 bytes
SHA-256: 42557a9642ed79d358bbe98802139d7481e842aca682868142ab7da03f136226
font_02_sfnt_off00011572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11572 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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