Malicious PDF — malware analysis report

Static analysis result for SHA-256 3426744c1aabeb77…

MALICIOUS

PDF

78.8 KB Created: 2021-08-29 00:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 965a42b301a9d5585bf14dd2f92fee52 SHA-1: 0e6b31cb4c91284f5a5ea8b13fc0019369373f58 SHA-256: 3426744c1aabeb77796d8cf3d882ed29a8999ba068e60d6d9e10c329b90f14b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to external sites, many of which are hosted on compromised or disposable domains. This suggests an attempt to lure users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://masterkontroll.hu/ckfinder/userfiles/files/38859408117.pdf In PDF document text
    • http://alibabashipping.com/userfiles/file/67567332124.pdfIn PDF document text
    • http://rld-carbon.ru/file/95480161231.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/19391177289.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/lbtpqppekbn9a72uqgqol9fohl/55367837270.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/gabepagazuzesekixi.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/rv352jekj37mqvutkfior50mon/bifibikejavepa.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/26699782823.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f209d6bd30---76403668704.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/57138496614.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/353a439e9a72c7af192853b293216096/79171464255.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/35625845540.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210618051827.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/9vt7i8ppiv39igair5tjpie3i3/13895780579.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/nuduzese.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/komerev.pdfIn PDF document text
    • https://asi-filter.pl/files/file/7409213495.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/wanadebegifan.pdfIn PDF document text
    • http://chromoink.com/updates/file/dezovetufonuxe.pdfIn PDF document text
    • https://agatanorek.com/files/file/nutadupuxidisixam.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d61811d539b---67461655168.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/68791698739.pdfIn PDF document text
    • http://hhcreunion.com/clients/4/43/43f38dc94a4d709fe78decf5bd9d7370/File/toxelukikavalujedorade.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/8b55eb32cc848c48b441c3c3bc090b5b/salufepuve.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec24b13a43---23072955241.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=kissing+baby+while+breastfeedingPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD103 10844 bytes
SHA-256: 19e7c0bdec94544c079120966f461238409669116f0bed9872a2ebba9068d6ff
font_01_sfnt_off0000e9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E8 16400 bytes
SHA-256: 322eb4d8b4c9258ed58e3adc63513ec72fa7571a0b509662b37b4c38bfb026f8

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