Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61e04dcec0ee535…

MALICIOUS

PDF

71.4 KB Created: 2021-08-17 07:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 36c1054b8087c7b5036f7a5381f42584 SHA-1: b74632a5e878d80f9732c881779cf4c55033ad11 SHA-256: c61e04dcec0ee535863021c09ea9ec8f59aa88b2be602a6fede4c187dffbdf55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated high maliciousness. Heuristics identified it as a link farm pointing to potentially compromised WordPress upload storage, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the links and the detection indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://raykingcarroll66.com/clients/2/29/292092747e06e0ab09130fa737b110c0/File/90715468605.pdf In PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16078cad0e4f1f---xezoroze.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acecba90c3---22463891549.pdfIn PDF document text
    • https://penal-garazh.ru/files/91540551498.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ef057aa19---39547633313.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/rakoboxerideluvunidavi.pdfIn PDF document text
    • http://jar-ted.pl/file/niravabubidesoreximot.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/q0t8k1l3ek3hf0h03u6sa3oas6/nisuw.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/a401c1f6cd8fed5c6153cac5a3e6c364/50333563049.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/6dmegvbg2orll2jf2htlcqit8r/4378132173.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/32155942164.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/virivejunugovigomovip.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0326307001628882248.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/52087755871.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/kf2iopjrtqundtriv8lvadi92o/pumanosesipeget.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/ferotagodeliz.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16099b8c9936ff---35345643738.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/jololobumuzejurutawude.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730b5d3c5c7---soxigedowugawupipejexituv.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/6ruclnkebbirm8m5mmlaqjtgf4/51731918140.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/74166877467.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbbf90b00a---temuzisafuvazul.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160f80afac5537---56900803434.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c38b4df0af0---54015163235.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/rozowogekokofafexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+you+convert+112+oz+to+poundsPDF 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_off0000b8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CC 15276 bytes
SHA-256: 65d3756d16c59108faf357d0bb2f7e2fced1bd4b2cc24fcac82f174246b3ca79
font_02_sfnt_off0000f6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BF 10796 bytes
SHA-256: 8ec6191078353626385086338e1297b780cc5f42537a3327f533ca2ed100cc2f