Malicious PDF — malware analysis report

Static analysis result for SHA-256 d94f09bdac0aa9f7…

MALICIOUS

PDF

95.5 KB Created: 2021-07-30 00:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0b349896fe3add60beeb8fcea14dc7cb SHA-1: 87cedbb328cdcd7466e2598bded6839ad5471b04 SHA-256: d94f09bdac0aa9f7a953ff43a04c3032f992958d6f2ebef884e1502b5738621c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://fresh-j.info/images/uploadedimages/file/46891497909.pdf In PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607247745fd8a---kamujesezukivawemife.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/guparisaxu.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/hgg8ll2irs9nfaq682r61d90sa/38928573909.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/mitizekalamuvozofite.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/84544693143.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/vuget.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/remazefid.pdfIn PDF document text
    • https://umartravel.com/files/gusiwet.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/40738898416.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/35222593031.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/4dptc1vrksqbnnbg6pjkkfs627/wotiv.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc805580fb4---21245614883.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/43879694671.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/xodiva.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/julexupepowomej.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16098c6d813bd1---57647258485.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/nudodutufu.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/28752399312.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/meseworofidez.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/89587165094.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/64567764870.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/seritiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=english+movies+tamil+dubbed+download+mp4PDF 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_off0001094b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001215d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215D 19368 bytes
SHA-256: 9e4a0cfa8e5c2589e40de32a74be1696ea9779303bfd1a10f952b05fe41aac90
font_02_sfnt_off00015560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15560 11192 bytes
SHA-256: d8dddd011fd97df2eb1d03d1bb1604bc30c339f7d2a40607c9433aaf6c5e3988

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