Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b8c634100e6bd84…

MALICIOUS

PDF

97.7 KB Created: 2021-09-07 16:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bb4e42f694d7dc54f07d1422f92f63dc SHA-1: 44fc38ee1e9b6f72d1a7abc476d9d3fb5e9bb5fb SHA-256: 7b8c634100e6bd845327b55dc568b515eaf546f8ec05775ba782d4c2a7167bda
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with many distinct hosts and links, some hosted on compromised CMS uploads. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document body was unreadable, but the heuristics strongly suggest a phishing or SEO-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/00to31074cft4dbb0f41bb4vjb/nuvopekidok.pdf In PDF document text
    • http://korytnica.net/data/files/pilomede.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/gagoboropadapeneragix.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/43825495605.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/mixeguboleluxaf.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/1791150622.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///xuposi.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/49674784cbffb2afc94a6b3b435fbe78/72743771736.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/11370477915.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16083a043100c9---lomerovedijag.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16122ad9276757---71111200581.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/d76cacb612ede2958ba400fc89c91be9/xuzejozulekuzebifi.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e078f9adb6---rufixebusapep.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/ivcapc9ightigvsf0jug43avm9/vewikeni.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acc084e0ec1---pizunenanetedivapasedoxu.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/4935943772.pdfIn PDF document text
    • http://mlight.cz/archiv/file/628577346.pdfIn PDF document text
    • https://tckontrola.hr/files/40369336685.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/65944046796.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a15a9a2a846---salut.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775fb7bbce1---tixenekufororaxode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=science+10+unit+6+relative+dating+worksheet+answersPDF 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_off0001173d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173D 11408 bytes
SHA-256: 5203ae674f118408a61dbed8a21bbf8cad563d3f94fee6b986913f3a9072f180
font_01_sfnt_off00013205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13205 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A17 18380 bytes
SHA-256: 9ea538b5c446efc687a187dd02d113e4858a794e759ef18b79a796d32ff250f8

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