Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7518698b09d6b2e…

MALICIOUS

PDF

116.2 KB Created: 2021-07-14 00:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9a1af7e37a7f3f5fc29a3da5ee4648bc SHA-1: eb79f439be9e02a9113794d519c711e07c048198 SHA-256: f7518698b09d6b2e5a348405cc1e937909b998e4794b7d059bd61c5dd8c4a1d9
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The numerous embedded URLs point to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators further supports its role as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=how+to+draw+a+pentagon+using+protractor PDF link annotation
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0938abbd0---98664285320.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/kulasitevidikuderuso.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/1293773116.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16080a648ba942---nilanilowiju.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c7b2cf4aa---tawesobimawaniregitajeki.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f57a3e079---katamufisefujibosa.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4263807b2f---79364462452.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/tebanarudilitufosadu.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/dc8bb3a0960b155b47dc41479ecc5fdd/losegimonevutepirebelojo.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b84d7752e---devetikukoposolot.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/50287461863.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/deluwiro.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/fcc940b4f1094e034027dc3d781f46d7/56747060968.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c45ef3c6a---97075450047.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/9357756572.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/8537803869.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ceda16705---77593864436.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/xerotum.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/li3dep59r4b2jf3aal3r3pank5/vodarekumi.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/6ar8fjdva99al7ing4n9trt0p2/11401242746.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/66366852771.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/xemibavomujomigepetuwevi.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/netuva.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_off00015780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F92 21792 bytes
SHA-256: 859ac406125c1c70edcaed9266f7fccd31e1f1e44fc9a51e8ac59e244429c17c
font_02_sfnt_off0001aa94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA94 10820 bytes
SHA-256: 46dcfa5745387847788204fba30c687dd64c784ac6ddd5b57f36b940205def1e

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