Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca78a5fc012ac73…

MALICIOUS

PDF

77.9 KB Created: 2021-09-17 16:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ccab496058c3e59b6e1afa62b30689a8 SHA-1: fb65f0bc02cc03f81679de1e71004d534ca77039 SHA-256: cca78a5fc012ac7382e005a42a72b0ac540e1ec4986ce94062e77c34bf101392
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it functions as a link farm, directing users to various websites, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the PDF structure point towards an attempt to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://brukspec.pl/upload/file/99005695206.pdf
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/44125595657.pdf
    • http://jainfarms.com/uploads/73307156164.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdaa0a1948---42096853088.pdf
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/rudanewemubabevave.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/33972477134.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16137bdfbefdb9---suganojokejilijor.pdf
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210904164930.pdf
    • http://syntra.pl/userfiles/file/32002279145.pdf
    • https://ptogel1.com/contents/files/nubipuvitizowugalu.pdf
    • https://zweefvlieg.net/userfiles/file/60025981453.pdf
    • https://ginniglobal.com/uploads/file/bedadanotemonimitaviba.pdf
    • http://wonikquartz.com/upload/editor/file/1631795233.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7175d9956---39561460200.pdf
    • http://branonperformance.com/ckfinder/userfiles/files/sububeder.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135779d133af---67156103421.pdf
    • http://qhchemicalsfeed.com/upload/files/87110085068.pdf
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/25960624224.pdf
    • http://umbabox.com/userfiles/file/segijunujep.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613022d627f5b---75273777074.pdf
    • http://www.themixchange.com/userfiles/files/vinusu.pdf
    • http://tdvvietnam.vn/webroot/img/files/40273167971.pdf
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/jagipebagamokidomev.pdf
    • https://ohcsi.com/ckfinder/userfiles/files/36298443486.pdf
    • http://fujavietnam.com/images/Download/25900257492.pdf
    • http://fotocaroli.it/userfiles/files/witer.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=love+u+zindagi+movie
    • 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_off0000c6f6.bin
c4d7d2ff4c9f77c15e4cb8297c776e2e39f02862fae048ddd79b120be4fae0b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F6 10364 bytes
font_01_sfnt_off0000de1d.bin
49720ecb2f94af694340735f230cd3647bf8f41e0e5a03ed714b2011832e66b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1D 19676 bytes
font_02_sfnt_off000111c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111C8 16792 bytes