Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e104df3b1ff773d…

MALICIOUS

PDF

86.0 KB Created: 2021-09-01 01:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: e2bf6b34ca33ede6ee7d4026a2553f97 SHA-1: 83f6875699bd94bbb692058faa9ae16934086573 SHA-256: 7e104df3b1ff773df719272a6f75d2daffe4108fcf5decc44dfbe10c82bb99b8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c26b526f5d---gofemitenix.pdf In PDF document text
    • http://jsushibrea.com/uploads/files/vakaz.pdfIn PDF document text
    • http://goldmustang.com/files/files/gemanozanin.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/36c05655a5c6f213402a0694ba116af5/jixolu.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/kitulafofenab.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/fib5in9d98r2phk02olfiakpc1/81201975286.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210716_AE2E86C80937307B.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/7148101083.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/88032489474.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/71330708345.pdfIn PDF document text
    • http://gptools.net/userfiles/file/lejitigafenedazujukokaki.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/derojilosomesuv.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/rogosanumukixapimib.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cad9cde545d---defiko.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/fugilupujagorizoxato.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/182313265369.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/rawazo.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/porurunewesiriw.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8f98803f86619a9099c46be5b832e850/xufiwabam.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/91954197665.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1741f5d0---78982873155.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/gulagonawurelujotizegolos.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/buketapuriliwarobazu.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/95235661242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=free+downloadable+lighthouse+plansPDF 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_off0000e71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71C 10972 bytes
SHA-256: 0241d44f6ff55aec72a0053696a3d888e03529d394ff094701157f94e9c8ccfe
font_01_sfnt_off00010019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001182b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182B 18496 bytes
SHA-256: ec9324117d8e53fc0cb68106afb377775fe81800e33b0b0e9e0cfbed14be658c

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