Malicious PDF — malware analysis report

Static analysis result for SHA-256 971a85de3643787a…

MALICIOUS

PDF

71.6 KB Created: 2021-09-04 18:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0ce8a4ffda5682d6d84675ded7ef2e4a SHA-1: 8b622fd02795da2aa412f15625c268d0264ad5e9 SHA-256: 971a85de3643787a18c31e6ad0a012dd714ebe9fdeb5a119fda0a12e13b8507a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous URLs, including one that appears to be a translator lure. The presence of external URI links and compromised CMS upload links suggests the document is designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://nomylo.ru/uplcv?utm_term=traductor+pdf+a+word PDF link annotation
    • http://www.kevimotor-rock.hu/files/files/49548026774.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/88966432189.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/voxafegudufa.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/ghrhc1eka16rs9std22mu3bpm5/najofamose.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/32a09f12a3f06258fa85979512f29243/66601532409.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612942fa1dce9---jeler.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/fevesufimufulu.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b2dfe8aee---93692638225.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/liduxugi.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/59339818837.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/22841911305.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f42d11a432---lujigojib.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160754e4593b14---romur.pdfIn PDF document text
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/82532743062.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/84033008708.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/b3bbc2dcd6fb93a2e39abc20fd6e5248/lepowu.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1f3dbae72---62624961514.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/49538662641.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/81988461192.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/jofavulirugumovidu.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb7c6de9da---46800279920.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/99698967991.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/e72fa3a76fb8359c23e1782fb4fc2e44/31401210120.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/lctefj4g8j1p66163tqqlfmg5a/53048583198.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/pirifenabisiwokewegeda.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/of7ct2aaqvioprcejv6ojf7cr6/muzufazupirirot.pdfIn PDF document text
    • 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_off0000b9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D3 15648 bytes
SHA-256: 64005cf53af7142ab73d3083c95c37d29a88df80930f60601fda5283a8126ca4
font_01_sfnt_off0000e16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF982 10220 bytes
SHA-256: 3a258114add41792098b1ba735c5f2dbb0092ba5c64b27543904602e239c04e8

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