Malicious PDF — malware analysis report

Static analysis result for SHA-256 60b859c3970cc8c3…

MALICIOUS

PDF

92.9 KB Created: 2021-08-13 21:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4fb65000d6e74b72a9bdceda63100bb2 SHA-1: b29574d71dc8d8c59791f4b8d6596ca3adc73608 SHA-256: 60b859c3970cc8c32a03eb4e32c0b5e9b17670cab7e3e3bb140b3db9b705fbd3
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. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/e2d1ubncpun7bh400f4j9pqa26/19997349569.pdf In PDF document text
    • http://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/48419816244.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5be73b2f699b3623c5bed2c1b0a2ed80/kurixoza.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9a271edf7d891b7de6aeeecf887fb06e/47096231463.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8059047756.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/xokekivowofamufobaz.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610ed6e84d264---polubupe.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/49231371656.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/98804734633.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8be7681e1a---potuvuvosimifik.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/eo753bhprga2g6dmh2uhflca12/jojunibul.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/5632281604.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c732126b9a---dadosikemifeje.pdfIn PDF document text
    • http://anm-av.de/uploads/files/kofotoxusenadimepijisese.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a210824d137---lovukisinuboresidijonatap.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/ripopedupolunavepexex.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-6-4/20210604094458533331.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/f4f64f55c4eab19993bfcd3b040190b1/18758792923.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/menasasuvowovojivekunudut.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/eacbc1a4745e963ca3549d6254429344/56672198044.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/93447743370.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/41368844663.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/74990365588.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/vvmjrpn9l4uvqam76otc0codv2/34329755093.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/22017053795.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/07d52b357a0ee47e3f85d06434b1f9e2/ludapusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=does+kfc+have+any+specialsPDF 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_off00010861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10861 10652 bytes
SHA-256: c9abe5adcf2eacc5d1a043fa5aa6fba15ac4ed14c4101fd9a983be340109f190
font_01_sfnt_off000120c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D3 17232 bytes
SHA-256: c2616648ee291e149e486a4571245d11a166c8747f898cf481fa453c811c2834