Malicious PDF — malware analysis report

Static analysis result for SHA-256 62ddd995fb006ed7…

MALICIOUS

PDF

95.6 KB Created: 2021-07-21 16:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ddfa4c2d01d36d1c789714e0caee97de SHA-1: 33d00a1bd6bf906d68870c4147d364dc541570e2 SHA-256: 62ddd995fb006ed7fe2d911e8755ae71a5d1f049e54290bc3bc05f4b9b0672db
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on compromised WordPress sites, likely to facilitate phishing or malware distribution. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/q87812ko7ul9aot8b0c5f4ut9d/553461412.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/abc885524098cec614678f3eb1214357/wutuganurafitobutegebosiw.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/51527682258.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/n4aqkhln3ul7hcq0n08cv31oh0/wubipe.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210707_4EB50A3678266E62.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/fomumevavelud.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2aeb61e63---todagitonulusubusinubof.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/668a44c00394ab88adc43aa4780d10b8/65110431144.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/18934705034.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/e7gags1qa6bh5knmddoqf14gq4/24411350125.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b32f4155c88---30211388419.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf00f1f390---pokex.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///53404944748.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fda4fd6fd1---17039423638.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b09488468b6---jigifaki.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/pssh7s14psv2aqm5tfke025vo3/lekanovirovolabimej.pdfIn PDF document text
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/vojenepiluzeb.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/riseranadewuzirewikuxi.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/xoxevuserexalirilolure.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/e625d37b98e8d40e3bdba70aac3b59e2/21595546840.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/78343309360.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d70cb16f39---78722485260.pdfIn PDF document text
    • https://argumentua.com/i/file/towejudokatozezigel.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/86483577097.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/85924971513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=hilarious+high+school+quotesPDF 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_off000110fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FE 10644 bytes
SHA-256: d082bcc76d94567fb6c60371ed9f21f0b0b415295c86f0beddff1aaa50c10e2f
font_01_sfnt_off0001292f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14141 18252 bytes
SHA-256: 5bc19b7839413a089c6eec309f28bbf752121ce12b575cf18f7075e11af04a75