Malicious PDF — malware analysis report

Static analysis result for SHA-256 e170311ee039df2c…

MALICIOUS

PDF

76.1 KB Created: 2021-07-14 02:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc3196e1bf756a2d4476305606d85be7 SHA-1: 86654b0d8124016e3dcbdab85af775dd23248984 SHA-256: e170311ee039df2c337a7aef1b0d05b5d3703531bd885fce75ba798a37495bba
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://tea-ra.com/user_data/upload/save_image/files/11132667181.pdf
    • https://jahanchart.ir/data/files/file/tafofarun.pdf
    • http://wisdomtours.net/upload/file/xugelupexazabulize.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/0853dd75fd4aa1118b71db2046979d94/metawib.pdf
    • http://soluzionebenessere.eu/userfiles/files/23634959073.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/bsuqgliua8026sm0uj9nlf6oe7/juvuwamepisave.pdf
    • http://otczenacts.com/media/files/68555500967.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd85941e5de---29779530465.pdf
    • http://pampa.be/uploads/userfiles/files/3427946405.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/4c82f0ae2d1804ef39b75c3a60f131a7/9179826020.pdf
    • http://hrt-foto.hu/_user/file/68709570636.pdf
    • http://antiochhighclassof70.com/clients/4/4a/4a4d67c83f6236388cbe8d22d68d4f91/File/piruvanavivujunokejex.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/7im4re912mkjkqhepjctfhcbr1/66811294453.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a8a304d44---88809580299.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b595176df72---55363976233.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/837d79fa17eb6719df5d865466393661/26352448070.pdf
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/dujatazogodedexoramoxuxe.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/hbemegarto2rld52qndjddnm20/vikitomi.pdf
    • http://2ds-creations.fr/userfiles/file/87914382643.pdf
    • https://luminex.pl/upload/file/6679911915.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1cc0195fe---84876289063.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pulling+your+pud
    • 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_off0000c5c0.bin
96a04c46022a606824db64664f36e41e6d2b39bd55d67e1fce5f039fe938920c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C0 10220 bytes
font_01_sfnt_off0000dc74.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC74 16792 bytes
font_02_sfnt_off0000f486.bin
b5becf9dfdf9c7f66f315a2dc42b91be00f85af7af8de89dd47c6ec38bf80f7a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF486 18348 bytes