Malicious PDF — malware analysis report

Static analysis result for SHA-256 656253e86c3a74e2…

MALICIOUS

PDF

90.0 KB Created: 2021-07-13 04:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a5efd604e8f218d287fdc3ec3ac252a SHA-1: 45be5f6eff6f75e409e414123bccdd3fbd142174 SHA-256: 656253e86c3a74e287e4e8cb975aba7462f2d0b9926c93eac286789352f18c75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, which is indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/3hv3gdt4fnn9782h5si0l6cf8n/59899152392.pdf
    • http://artecgroupservices.com/imagenes/file/fipexepabisobijolabo.pdf
    • http://royalrep.com/userfiles/files/62626103938.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/9a69b89f8f61cf6b5ee0d5bcf872a2d4/14168707394.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a96900b0c1---73006004285.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c0067e896b43be2ea4555bbca8eda0f6/tumivirobanipezik.pdf
    • https://alzubidi.com/userfiles/files/33342606560.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba349ea2c1---29616956164.pdf
    • http://gianniarnaudo.com/userfiles/files/xisikipamunugivudili.pdf
    • http://biometria.pl/photos_fck/file/51755243105.pdf
    • http://dermalab.pl/userfiles/file/timipopokozirasalolakag.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/a4kknftg93ctdqjgmdo2islbn5/vubixapupuri.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b531a720f---kilidob.pdf
    • https://viettincapital.vn/upload/files/matek.pdf
    • https://verandapattaya.com/userfiles/files/xafesodumejesuba.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16098b5586f227---46990944404.pdf
    • http://jevades.com/aircraft/fckimages/file/xotevapigigov.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e02e16433b---86313087854.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d8cf94014f6---64216913667.pdf
    • https://guclupin.com/calisma2/files/uploads/vifider.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089331d24b01---83224347211.pdf
    • https://familienbilstrup.dk/ckfinder/userfiles/files/gaxaxozenewotezesibok.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/217998c28efb5195ca6c7b2acb2837d9/kufisovujofopoxosolepu.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075b3c19573a---99642514680.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/59n6rir3jdi0o54k1n159tssp9/gaxosagowelibuwepirajake.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=theory+of+porous+plug+experiment
    • 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_off0000fa79.bin
385bf3e3fd944a2a5f090fcd0f32762b333c052fb29273e8b138e535a03bf765
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA79 17812 bytes
font_01_sfnt_off0001298d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1298D 16792 bytes
font_02_sfnt_off000141a4.bin
e102aa90007f2d567f2d0bc3262ba7abf7ed2af09978d248c63faab6dcc4e683
pdf-font-stream PDF embedded font (sfnt) at offset 0x141A4 10920 bytes