Malicious PDF — malware analysis report

Static analysis result for SHA-256 03c600ba47df636e…

MALICIOUS

PDF

83.9 KB Created: 2021-07-31 12:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 47f53dbcd39fd19f9cc69a529c5bc85c SHA-1: 3c7b5b971ffe4b24515163c948b0f043400eef18 SHA-256: 03c600ba47df636e51a6c2fda7da4004d9c1ef2f6847cbcb5824dc08be016994
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress uploads and disposable hosting domains. The document body is heavily obfuscated and appears to be a byproduct of the wkhtmltopdf tool, offering no direct user-facing content but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f844dc01eb---79062566234.pdf In PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/79b9d09886d3eaa9fdb62fa80caab094/14484015938.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/29809404200.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b74ee13cd53---79769270390.pdfIn PDF document text
    • https://naoshima-habitant.com/mumonipuwosedogawafexem.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210602_6394AF5CEE142F98.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/eedc66f616f7eba8f3b459edddd80bdd/lanugogizipavemimemaloka.pdfIn PDF document text
    • http://dejede.com/userfiles/file/fevepobetupiz.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0db86533d---kunefogadedasoviveduko.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/wejenevuretotiruvuneru.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d35fccecf---63770212029.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/rezezikufiruzuwalat.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/3b6e1e69bd0af2dacfd47976eabcfa6d/32956635965.pdfIn PDF document text
    • https://topupdana.com/contents//files/ramitisokadexekipi.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/a2c895a8f15c99e78f342c829170715d/91280256393.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607368090db3b---bufutiwisejenig.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bdb367726---23647495223.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/40083106343.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/xamofufut.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/9655945227.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/dedopijuteku.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/a6d07c822d541aaf74f8ab4623059236/52024910852.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/97478935619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=rules+of+exponents+worksheetPDF 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_off0000e556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE556 17052 bytes
SHA-256: 6db77b3468f999f5b4694ec2509ef3c79a9d8dc9b9c269c9104e79174cb94e62
font_01_sfnt_off000111ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D1 10624 bytes
SHA-256: 5b41431df6ee264f0b190c94a1626b3c62c9524259a817e5b39fc8643f739aca

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