Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6be08e0b22c095…

MALICIOUS

PDF

88.8 KB Created: 2021-09-08 06:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4d9a9ad95e6a94aad09e7f74f03adb23 SHA-1: af5cdec430c5f7bcbfc7f790df046f4186124f89 SHA-256: aa6be08e0b22c095cf99b86c0659102a0416ce6bfc1eb014e017c24b6e7d6b7b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 http://thermcom.cz/userfiles/file/11412447861.pdf In PDF document text
    • https://mariellatriolo.it/public/file/kabipogovolajupekujalan.pdfIn PDF document text
    • https://linker.tw/files/kazewewuxoteg.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/2052646629.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3349de2710---9332857780.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/84607246218.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/74642471570.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e0f83b9ca---nejurokuzelawib.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/tonovisubilodibo.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/mowamal.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f12bd076a---polatozatuwafepejis.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607883519e2af---56269036567.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/56136670722.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f563b8e2a---56202253022.pdfIn PDF document text
    • https://tmtteks.com/files/26527590133.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/raganawax.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/fr8ovg0nsfhjdopamms5v142k6/45617264138.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613677ee5c7e2---68501898876.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210603085325.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c2b539969---ferepujoxavidadevige.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/tobogodilitawekoxibodakuf.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1611b4dc13ea6c---kabonajilese.pdfIn PDF document text
    • https://scalper.ir/data/files/file/59966007980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=arithmetic+rakesh+yadav+pdf+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2F 19628 bytes
SHA-256: a9b6f2d6685a7953aed48c6c40a87452f101c6907dbebe123eb338062e976a98
font_01_sfnt_off00010db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB8 11224 bytes
SHA-256: 64c4b80c6231db671e589c5e45b1e49fc43ab3b7f3e7f7dfac3c677d48d993b0
font_02_sfnt_off000127f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F5 16128 bytes
SHA-256: e086d997b6ee3c3fe48f8fdf49e8854b9e9bef9c53b5c2c5f26bba4f2b277426
font_03_sfnt_off00013d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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