Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9324f0a568859b6…

MALICIOUS

PDF

71.2 KB Created: 2021-09-22 10:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1f5895215bcf9a2416a9be0f30cce249 SHA-1: 454e9f5b7d2ab57afce54ba2747327faaeaf4d36 SHA-256: a9324f0a568859b6ea50589eb65c727119fa86fbfcd3e4cf2331f3bc76c08f75
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to various PDF files hosted on compromised or disposable domains, suggesting an attempt to distribute further malicious content or engage in SEO poisoning. The 'SE_CALLBACK_LURE' heuristic indicates the document likely contains a phone number to trick users into calling, a common tactic in phishing and tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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
  • 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 http://babyindex.nl/images/uploads/sofubifaravaxegawax.pdf In PDF document text
    • http://1night2day.com/UserFiles/file/66395062194.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/67149932806.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/25332516497.pdfIn PDF document text
    • http://www.edgartownschool.net/uploads/files/15179263907.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/5f2a28461acaea8d01a74197760470e1/68704181197.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/zatidatod.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/46535309347.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/13189493737.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/luwigi.pdfIn PDF document text
    • https://mkontroll.hu/File/polupufadez.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210902014339.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/xagajafi.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16136a05a563fc---duravamaxiralupoletesuna.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/57583359498.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/kopanefulos.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/jinurejimavogo.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339c7f3379f---dexibazipus.pdfIn PDF document text
    • http://houselandia.ru/files/jasezema.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed12b772c2---sezenigopowarugi.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/rugepemivirimajigamikusan.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/30010197778.pdfIn PDF document text
    • https://iwistw.com/upload/files/xodim.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/gulozebezaxewasogapinumot.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/muxibuvibonerisaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=naruto+shippuden+ultimate+ninja+storm+1PDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/25645235779.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_off0000b33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33F 17164 bytes
SHA-256: 9d1102621dd2f01ef3a1dcb2616d305c6282bb921327b8299d6574e6ca63172e
font_01_sfnt_off0000ddc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DE 10916 bytes
SHA-256: 06e14059feffb935a89a724ec27d93fab89735389afb1107865c3be2e58cc4d7

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