Malicious PDF — malware analysis report

Static analysis result for SHA-256 457ce22d4f421c8b…

MALICIOUS

PDF

85.9 KB Created: 2021-06-26 07:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0a259fb410f27965ac0ab8a5fdfc06c SHA-1: 3e71688858063b0d3c7491930d08d5004d2487ea SHA-256: 457ce22d4f421c8b1462008d4a3090fbca42e37d984ab24a24a39dd86859eaa9
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the structure and URL findings are sufficient to assess its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://drivingschool-brno.eu/files/30653885791.pdf
    • http://skipjackpoke.com/ckfinder/userfiles/files/36216572064.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4395fa16bd---suzikaxom.pdf
    • http://absolutelyneon.com/userfiles/file/ramamixunujubebivik.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e4632573f---xuverolaxomulodexif.pdf
    • http://brenno-tojestto.pl/userfiles/file/tozuj.pdf
    • http://haustechnik-hagenauer.at/76850822252.pdf
    • http://pnmanagementsolutions.in/uploads/rorozajizi.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/4d57e1c53cdbfabdbbf355117a541f0d/14033358724.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/98395bb80f523e8653d73842d7a71cc9/gogamuzetogebemegemox.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9921705da4---37648152057.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b891ee52cb5---47515822446.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cecd4170d8.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/4942931dc60a2a1f24610839048da078/36738983866.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a55f69f1000---97050173233.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/45e66304b25732be77b3e10c8097211c/katiki.pdf
    • http://aranykoronakft.hu/userfiles/file/8630542731.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/bagesudesosaz.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/cb4fa54f348e155c23f35aae9b860b35/22675128956.pdf
    • https://imagebeaute.fr/userfiles/file/80622852085.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/tekanafokewovon.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/132c861f27c2c684c1aace6e67e8fec0/lutepedelokozid.pdf
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/19601130996.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=somerset+county+jail+me
    • 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_off0000ec0e.bin
a9c53a703cd5b66620422a12796fc74b84abccec50392dae0d4ba50485dc3391
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0E 10808 bytes
font_01_sfnt_off000104f2.bin
00b69973946fd3d4aeea2c35333cd5b1add0707e7296710062d35182c011959a
pdf-font-stream PDF embedded font (sfnt) at offset 0x104F2 17192 bytes
font_02_sfnt_off00013231.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13231 16792 bytes