Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5932727c5199f46…

MALICIOUS

PDF

70.7 KB Created: 2021-09-28 14:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 027680c0d0ee31f0d498b79647ee3100 SHA-1: 6bf045090fea957aedc74e2b68689f6bc37a3ce5 SHA-256: a5932727c5199f461df739eeb7f07344cf86bcc5625c888f1109145fef179038
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves luring users to these external sites, which likely host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://chcial.ru/uplcv?utm_term=cold+desert+animals+and+plants
    • http://villaroyalenews.com/userimages/61830312768.pdf
    • http://aokunoil.com/ckfinder/userfiles/files/8878534540.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613b264a5907c---sigonojajogojuserubavafa.pdf
    • https://laptopserwis.com/app/webroot/media/files/womugefadesurowan.pdf
    • http://tuanayapim.com/rsm/files/virureruxukejatode.pdf
    • http://www.pethouse.es/ckfinder/userfiles/files/61568646279.pdf
    • http://porpora.group/imagenes/imagenes_contenidos///12804774719.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1614291a51abb9---60965755329.pdf
    • http://hawaiianhunareiki.it/file/gosiwonin.pdf
    • http://rspon.pl/images/wyswig_images/file/fiwuzivumonafepete.pdf
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/zevijekeduk.pdf
    • http://abwnickersonplaza.com/uploads/files/72185241597.pdf
    • http://aaz.sk/editor_uploads/files/matatexivujom.pdf
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/97920156826.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f0116828da---kesozibiravime.pdf
    • http://bartuceviri.com/userfiles/file/23744470749.pdf
    • http://elpijisystem.com/file/69057014447.pdf
    • http://csp.hu/editor_up/17702583844.pdf
    • http://www.kevimotor-rock.hu/files/files/lavosave.pdf
    • http://busankid.com/webfiles/board/file///98829068675.pdf
    • http://klhl.com/userfiles/file/nilakopok.pdf
    • http://drentmedischadvies.nl/uploads/files/muwopirovafagofunaxiwik.pdf
    • https://betenagro.com/sites/default/files/file/37903503850.pdf
    • 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_off0000b1ba.bin
f40bcb6c5f1288c02e52913e41e1381b948e00c5a9a675fe238b353fa49952f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BA 16884 bytes
font_01_sfnt_off0000dcd2.bin
02d5300d54e9f137565b47261fda47ca80bf563846d80f24ea2f47693f77fbec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD2 10584 bytes
font_02_sfnt_off0000f4ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EE 16792 bytes

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