Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b0b5ff3b8f7e61…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 00:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a884379ee9e107f4d815ec455efa011 SHA-1: 2ec7303920a7aa54992b4910d1d64d75cc92ba01 SHA-256: 11b0b5ff3b8f7e61fe7572a8a1ad05721e540fba4f1ba6d47ce12b672f951473
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nomylo.ru/uplcv?utm_term=pokemon+remake+ios PDF link annotation
    • https://topclassgreenery.nl/images/file/50435403815.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/zitigikitejepizipaliw.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/vekosu.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/bodufumanifawetijoviw.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/buroxuwidemixibaba.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/57479450179.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136f19056d50---lemuzeka.pdfIn PDF document text
    • https://tessuno.com/upload/files/612ed6c00407e.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/napokeregubesazo.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/vetat.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/82817319204.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/64411962136.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/994910019.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/julesanal.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/tanuvumokimevidagarevasef.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/92606350878.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/leberuledosuvozila.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613485f0826a6---98999706420.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/57596270942.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/38947415939.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/1f8649b4ed96d994e31e9b8b939756df/luwutavetiweketasarosir.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/77470221644.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/77082514677.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/paviliraruzab.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_off0000d95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95F 18380 bytes
SHA-256: 281a93a77c3d6b3c98fb52a86d06ce2af410dec9fc6a7ac21beaabbe231fcad2
font_01_sfnt_off000108e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F9 10220 bytes
SHA-256: afe7c3842b895c5f0d34798c9c88674fdfcd2dfbbc680cff13dfd4ba2ac05aa6

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