Malicious PDF — malware analysis report

Static analysis result for SHA-256 abcd188f18ee4d35…

MALICIOUS

PDF

87.1 KB Created: 2021-07-02 08:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4170de3fc54de5f6a1da7ee7bda51bd SHA-1: 503a4c2a5fd0cdf3355fb1584da27caf93001073 SHA-256: abcd188f18ee4d35b9620cd9555dd5f71d0b47a25076f8ddc6bd2d08d60a60ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of multiple distinct hosts and a high number of links indicates a coordinated effort to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://mid-europe-ex.com/images/blog//file/miribepafobidoruluvetenir.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16094c1c89c0b7---25816485897.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871ec27b9fc---wadifajedezebomibuba.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/ckl18a29n98p2rkokq7betpghc/waguradeduzekoper.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b2428b3c1---wasutipoborabarifo.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/s573bgpqr5i3amnkns656n9il7/6782097856.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160781512236af---38836527693.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16d7134d66---gavedematawafasuw.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073b676bac85---10674899922.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075b45ce5151---21122769391.pdf
    • http://youandisagenix.com/ckfinder/userfiles/files/40073620639.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c745ac6d82f---23719838412.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a98fa6843---71790899577.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/8823f673f27c9cf5c65cb8e9095a81d0/sobelelasunik.pdf
    • http://lookkorea.net/userfiles/file/57425336532.pdf
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/pagsto83i8c2qtp86nj65tq9oi/26315062738.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076ff7d04c19---95552164555.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/u2sk8m9bci2olcgqft09q6a1q6/fadazumi.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b731c5e902f---39142816180.pdf
    • https://transmar.biz/ckfinder/userfiles/files/52764565076.pdf
    • https://xlspandoek.nl/userfiles/file/bigubifubojoji.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba1c1f551---koduvuz.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d306e73822457b270156ca70dca86919/fijikonagirozujupa.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/5tg0cornvkjo3o2lqinecrq24d/74623368527.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079d0ea790ea---rapaxexematije.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825e3552ddc---numuzobadidoduxid.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=eutrophication+meaning+in+odia
    • 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_off0000f26f.bin
d12dafd7672d06199393bf7b87fda88bb96e895d15b6ae07b7b9fd6228d546ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xF26F 10828 bytes
font_01_sfnt_off00010af1.bin
ad45fd1bde9367dac50af903b2d3eb3cb59c0ca232767497361d7a70a139fef9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 16928 bytes
font_02_sfnt_off000136f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136F8 16792 bytes