Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa03f4771198e8f…

MALICIOUS

PDF

80.6 KB Created: 2021-07-07 06:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 04b59688019e27742dd439b13721577b SHA-1: fa8f98a2670a4a22dd7404205d9f4ce380ad7cc3 SHA-256: eaa03f4771198e8f6c61ad1ff100ece2fd0b559d25748318d02ea19a314e778a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links likely serve as lures to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c0e1b32c6---keteruvepidizenet.pdf In PDF document text
    • http://annandale1963.com/clients/69704/File/wizasexoxukabatak.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/pevefisej.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/jozik.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080a249b6902---32974762173.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/vikuzo.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/1302955370.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160778ef081d18---wawonufo.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/63db5553b40b655dda352007f196bfce/98937025859.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/zekenejisenamasu.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/00a82470ed965fa77ba95e5f2451f19e/topepemivenida.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/90683239879.pdfIn PDF document text
    • http://fygl.net/uploads/file/240300264001.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608673dea03fd---wozutejakureke.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210704083433084.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/f5812e4259b943f5fa44a4d6a5b1d223/95081948949.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ab1b79894---25272951719.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2ffddb3f1---xekelosipiripupumezazi.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/2694f9480e74e54b4d5f84b2caada15c/waxagigiwazolibileg.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16086b28a09cc7---nudupuxiremiritam.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/40740168870.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607085200668e---33436823903.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/61393533126.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/31765039755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=3+digit+multiplication+word+problemsPDF 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_off0000d8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EB 11260 bytes
SHA-256: 51214a75bc801d34c0f46d758eff7fd79d49463945cbb3bdae2ce1eb83053847
font_02_sfnt_off00010aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEB 16232 bytes
SHA-256: 10c8ea0fdfeb215a5bcdc4b8f2bfcf27d464f99cd93cd3c8b9ab4a50de3271e3