Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfbc1dd2cbebddbd…

MALICIOUS

PDF

70.0 KB Created: 2021-09-30 15:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84dae6fa9d0169e3f691be1014036c01 SHA-1: 456df4d36fd04f5ed8051053d3bec1061ab7cfc1 SHA-256: dfbc1dd2cbebddbd508ea1601dbe5edf3c29f5e725787fde389213ac0ea33873
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to manipulate search engine results or redirect users to malicious sites. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 5

  • 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://tcsklife.com/filespath/files/20210928212943.pdf
    • http://balie.overeembv-profielen.nl/upload/files/72788610788.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d367e364f4---63182456940.pdf
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/38126773831.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161409135b4b00---7875687760.pdf
    • http://embody.box8websites.com/ckfinder/userfiles/files/bibagonageruvib.pdf
    • https://biorenta.lt/ckfinder/userfiles/files/6611951247.pdf
    • http://www.valathors.com/ckfinder/userfiles/files/9914915079.pdf
    • https://fereshtegan.net/basefile/fereshtegannet/files/56295935659.pdf
    • http://topbuild.net/content/xuploadimages/file/badefozutadur.pdf
    • https://trompis-tondschungel.de/userfiles/file/rasevivaroloduv.pdf
    • https://drjou-vc.com/upload/files/45491436063.pdf
    • http://ghibms.com/userfiles/files/sisejizik.pdf
    • http://www.frank-diagn.hu/userfiles/files/11965721166.pdf
    • http://pushgroup.lv/userfiles/files/71582697608.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/14786251668.pdf
    • http://dental-forum.ru/userfiles/file/zawelizebezefujolupisam.pdf
    • http://ageofwonders.buka.ru/sadm_files/20867506093.pdf
    • https://hotel-la-licorne.fr/userfiles/file/dokidi.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/8017c3eb92850202cc5b1ffbc27ee4cd/namosisejesurujasipukulen.pdf
    • http://dytac.hk/userfiles/roborobokesogege.pdf
    • http://www.prakashirrigation.com/uploads/fck/files/85051874241.pdf
    • https://wupaojichangjia.com/d/files/668166418.pdf
    • https://kirbas.com/img/uploaded/file/jebegowesanaxavo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=hyfytv+live+tv+channels+kannada
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b036.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB036 16792 bytes
font_01_sfnt_off0000c84d.bin
6e1c9af17ea652863f9a55cc99b29cc309c45a25b99dbfefddb3f0ecc1fddfa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC84D 10616 bytes
font_02_sfnt_off0000e079.bin
0e3e4738de076173d023812cc9530b27826759b7693d4e5befce383dc543dd72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE079 15996 bytes

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