Malicious PDF — malware analysis report

Static analysis result for SHA-256 186fb5772a77bd85…

MALICIOUS

PDF

82.2 KB Created: 2021-09-12 03:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ed0a570d45d46d1ae564d93cc567f850 SHA-1: 408568715372801adecd134dabca4f403994381d SHA-256: 186fb5772a77bd8539b788bf55a182a03d2bcb226e7b5798271321994dba957e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ros-audit.com/i/up/file/11654869848.pdf In PDF document text
    • http://xn--eyt274i.com/upload/files/55981842075.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/satibir.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210912010724-zevemigaxexife.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/nifuxesaremekad.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/nufeni.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/gisukuz.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/6188930314.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/sewowareronemefalarelowit.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf9aa2d608---fabujorudu.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/misiwes.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/31813635287.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/5118605636137e49934a64.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/73702817218.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/silatijufalubavikipexito.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/d10bbed67139f56ca874f252fd4cce9c/jujefesufofufepofu.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/kokugodonikiwexomen.pdfIn PDF document text
    • https://baglab.pl/galeria/file/kitimazafis.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/kelekamifewozirujiva.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16132f21685995---73305048957.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/zufemivo.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/74894462690.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/kurizifetanu.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/38950683439.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c3c68b6a1---99579327279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=apps+that+you+must+have+on+your+phonePDF 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_off0000dcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD0 18000 bytes
SHA-256: 3a44b5987309d96e7ddc84bc690c152ffd048b8c45918f12459fef4515579238
font_01_sfnt_off00010b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12319 10640 bytes
SHA-256: 3eec7c16db719612d66f7cd2ddc861a5d3fabff7546ea48b7125713abd534dd2

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