Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe2c6262d7a2000…

MALICIOUS

PDF

86.0 KB Created: 2021-08-01 10:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 5eeb3e8cf1501e32b5f36464ef1c0292 SHA-1: 155db5084c9c7e2584ee763f25f13671b17dffed SHA-256: 4fe2c6262d7a20005eef5e8417aaaf99d12b8febcc645787d31aed328f2761db
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/cd69bd3d67ddcd502a51db3f559ffb77/vizevadosifewokeregi.pdf In PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/41474608168.pdfIn PDF document text
    • http://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/49314181168.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/45581351f97a969e6915cbad019369c0/93734622950.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7ado1acngnp8h7l199d58n7r37/44396046247.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/57182902367.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3bd67ee194---xuresamipapapedupa.pdfPDF link annotation
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f52ac2c22c4---xitojodakomupexedana.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/4883566812b5a2ef670b2b2ba524d6ca/simaguzesonesox.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e54d6d53ebd---13453244955.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/68644089252.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/36m9hig3v16s8amoktt0a4a7qc/jagiwapuvolid.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-27/20210727043230781264.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/aa643739b53daae6d538403831300033/felimojokalidute.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/zogabuzafajaxaforurobevod.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/doromiku.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608966f143cd8---gemevigega.pdfIn PDF document text
    • http://newmanclassof1965.com/clients/4/4a/4a7b3a1a0fb21659e68ac19badabb541/File/mibelizoxelumizogesu.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/50139197489.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a375a96b62e---3928818770.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/ff22b675faf5757d357c21d91ca44009/xofidudozilugi.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/xajudixakisalerubokow.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df6182e195a---botetebolaxej.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a689063323c---xefenanikigubixuradapu.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/95231629687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+disable+gaming+mode+on+keyboardPDF 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_off0000eb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3F 17308 bytes
SHA-256: 6d87a3654c4c72e37ae8ac408cbf494d3846c5543d3d34fba73f5992bae70f1e
font_01_sfnt_off000118b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B2 11012 bytes
SHA-256: ef7cc4103c3b4dd7708558273ca206782beceab6a70b8d756ee1ba0413639361
font_02_sfnt_off0001321a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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