Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6fc04ab1e117f4…

MALICIOUS

PDF

78.0 KB Created: 2021-09-19 19:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 60629a5d878d8e071d58ca4681ce78c9 SHA-1: 57f49fd18cece5a17dfb459efebc0990b4ca96b2 SHA-256: 9b6fc04ab1e117f4901ac605e37aa739351d94c4229621147afd613f0a71ebfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as containing a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the presence of numerous external links is sufficient evidence of a malicious pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • 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://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5b6476eb8---kewagiwiwo.pdf In PDF document text
    • https://fotokeramika.bg/userfiles/file/3121411101.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/biguladumusefunepub.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/vazoranuxopibulupem.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/19595203578.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/77077592139.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/76171968712.pdfIn PDF document text
    • http://pedraferro.com/files/files/gutujo.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/71070134988.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/79142570624.pdfIn PDF document text
    • http://com123.vn/uploads/file/ferakibanufegoru.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/lagosa.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ijfs0eiq0e7p3q22hai6fir8g2/61541286601.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/lamaworigijukevirug.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/jelowa.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/93396768307.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146debd28bde---zosuzipujekizeperazaxaru.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/80403287295.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/finifepulefetofinobam.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/tetikigirexazume.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/xofanutebelavuxuxugokogim.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/15157419634.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/83463382508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+take+a+screenshot+with+a+galaxy+note+10PDF 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_off0000cbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBA 17428 bytes
SHA-256: 62dc692821ed02cfe2f7053e67557412358ca67f89d697af4f325bc87fd2c013
font_01_sfnt_off0000f8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A2 11068 bytes
SHA-256: 70b5b51bab2bbe746b1aa1578521d0715edda38c8d4c563aa73a044842f820a1
font_02_sfnt_off0001127a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1