Malicious PDF — malware analysis report

Static analysis result for SHA-256 3396ceee9aaa8be9…

MALICIOUS

PDF

89.8 KB Created: 2021-07-31 17:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fbe93c84117c1d063a99b5ca77e3dc5d SHA-1: d34fa954db82e13c1bc5c78a612134c8fe3ee38a SHA-256: 3396ceee9aaa8be9cfb1f069e5d0c1d2ea7bd4173ebc1766c7ecd317e5e0752b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious, exhibiting characteristics of a callback phishing scam by prompting the user to call a phone number for support or to resolve an issue. The document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting an attempt to host or redirect to malicious content. While no scripts were directly extracted, the presence of PDF-specific heuristics and the overall structure indicate a malicious intent to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://coretry.ru/uplcv?utm_term=demonstrate+how+to+use+basic+clerical+support+technology PDF link annotation
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/3baqnu4nho6n5tvj7b6vh44q0c/10426748328.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/xafesefuvo.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/xatezonulosirexozaj.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874385ce838---rudujimulib.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c81b5e7ef7---89689236841.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/gezazutimaxemivulam.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6b0e8dd37---74931760396.pdfIn PDF document text
    • https://indianpowerliftingfederation.com/userfiles/file/lalorulejigalikawet.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/pagikezo.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821c55440f6---66631181263.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ad8183270---lipexupovalij.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/3550354947.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/jeresomizeduleg.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/564a5764d33b0035717070f6c3b3bd99/35741903205.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f20dae32a---manirujer.pdfIn PDF document text
    • https://littlelightnepal.org/userfiles/file/44247716210.pdfIn PDF document text
    • http://skomi.ru/img/files/file/56376248150.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ka3ulsumgej22pp0n4k9h89ce2/11531285885.pdfIn PDF document text
    • https://ahha.az/userfiles/file/vufosemesotujobepi.pdfIn PDF document text
    • https://linoforti.it/file/dulil.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/36582909909.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/makebafafukutegi.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64e6f3dcbf---ponutafimefunizobomen.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86de0ef005---28901545732.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb00bc1291---58840735703.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/podosajatap.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_off0000fb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB19 11260 bytes
SHA-256: b15b773cb674018ceea1256cc6e2d9cbf8bd0741fe08319beb1728621170c2f3
font_01_sfnt_off00011532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11532 16640 bytes
SHA-256: 45eca730e3a6aabfc1ff994122ac8a93edae7f1df2fb217a910b885dba609946
font_02_sfnt_off00014032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14032 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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