Malicious PDF — malware analysis report

Static analysis result for SHA-256 347b3a76b0d74dfb…

MALICIOUS

PDF

87.7 KB Created: 2021-06-29 17:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 15c06e782e778c6779eb2a9807e4f295 SHA-1: fe04e80446d82e88d7b1e9aa9bad8073291698b1 SHA-256: 347b3a76b0d74dfb0836d8a34cc95eb2935ea6505d6fb16f6d927ff4a76ea50f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the links suggests the PDF's primary function is to act as a lure, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://huntic.ru/uplcv?utm_term=another+way+to+say+eco+friendly PDF link annotation
    • https://diaochue.vn/userfiles/file/vaxunesuzoxoka.pdfIn PDF document text
    • http://placc.info/up_image/kukakovavajar.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/zeperorinedup.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/i9fj4neogbf2e035t0e99snidc/jusudu.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/39cbbc7f98f95442f1ea1aedad7dec71/61335748599.pdfIn PDF document text
    • http://www.bandungmesin.com/file/zuzunujul.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/lopitigesedajar.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd5a27da3c---zebug.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/gisugudotavetuwobor.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/turazuzu.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/caaadf6aa98857ec9275a8f887e7c5ee/jenirike.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/55ca337caeffe3ab62459c6f92d42cec/61305177616.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf2ec435f0---guxatenovezurebudegaratos.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/74315817974.pdfIn PDF document text
    • http://usdcp.jp/user_data/userfiles/files/31698770357.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/11751904401.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/regeguvesixotajisukixa.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/doledazem.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/kupavanomi.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ba147c0c0---8214564591.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/fcc0304a38bba0c495b7ba119ed8388c/45961551788.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/66694433392.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c19d80072---zelozutunumi.pdfIn PDF document text
    • 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_off0000efc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 10756 bytes
SHA-256: 8c87056aef6341c7696d598eab3097c9cdd3f2bc4eae165f25bb3fe2e27ac740
font_01_sfnt_off00010891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10891 17856 bytes
SHA-256: 43f64b9670d28009649a86ae1786c834104bc5cc5c798886d9149806fab90397
font_02_sfnt_off000137b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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