Malicious PDF — malware analysis report

Static analysis result for SHA-256 76df2b39a893cde6…

MALICIOUS

PDF

103.2 KB Created: 2021-07-06 15:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc87a62b4d999f07f8fb1e21bbe9200c SHA-1: 5c95700aea8a15b0fc40a531797e3ac96869ff2b SHA-256: 76df2b39a893cde6eb98d5e0c76bed8ba8df2189b9c535aacd647d84bfca7ca0
156 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting. While no scripts were extracted, the structure and URL patterns suggest an intent to lure users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/up2os689pf5nd1ps4o69vfk4c3/4136612596.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160afa04be4bde---44928783759.pdf
    • https://damiel.eu/userfiles/file/polipezimifemuri.pdf
    • http://tivatijapan.com/uploads/userfiles/file/80141128136.pdf
    • http://curry-box-deluxe.de/userfiles/file/25851828683.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ba6113d5a---luziruxenuf.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/aq4j1ci8nhsjc0avva5rg7j19a/rabunigi.pdf
    • https://nevisnews.com/userfiles/xopedigusibox.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfe6b9c0f7---13198723718.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe325cd479---5027330109.pdf
    • http://www.northern-japan.com/image/upload/File/96953067224.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/kkibhnrorghrcmfuicvh265m33/suguke.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/18ab219d426775dd19d5a7013fdc87ad/dabapuzemugogimepav.pdf
    • https://strategieb2b.com/userfiles/file/dodonirel.pdf
    • http://erdbau-rauch.at/fufijoxokiwuwivisikelirek.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/7e976982683df165aa8ff2cab66df6b2/goniwazibuvekevalax.pdf
    • http://kardelendalgicpompa.com/uploadfiles/file/2691813229.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c151b5a504---66202511691.pdf
    • http://07-3739589.com/CKEdit/upload/files/diburetibase.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/aa771c2a95f333a014eadeac6a344591/rutepiritiwokuxizu.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3bdc85a18---34331265801.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aab65020e9---zovubuwifedizibefafejel.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=speech+recognition+using+matlab+project+report
    • 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_off00012b65.bin
1a65eb7afd2e9c157ad82fc341dc0d1da0545b0d7133bf56e06ce1cc41612920
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B65 11268 bytes
font_01_sfnt_off00014560.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14560 16792 bytes
font_02_sfnt_off00015d72.bin
43deea97714a019216aa7b885e4877ed306dc8eb86272e5cf91b6c71cef852f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D72 18760 bytes