Malicious PDF — malware analysis report

Static analysis result for SHA-256 7812543dd3064ef7…

MALICIOUS

PDF

90.0 KB Created: 2021-07-02 08:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e4775e0f2bbe50fb42c68ae6d074cc6 SHA-1: a2e9026c9c79003764507797e77cc568cb608851 SHA-256: 7812543dd3064ef717fd717537fc6581acdf792de2f572debf588fad171a21e7
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on compromised CMS upload storage, a common tactic for distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, while many are unknown, point to a pattern of redirecting users to potentially harmful sites, likely for phishing or malware delivery.

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://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608abeef69c50---tuzujujokubanitader.pdf
    • https://iltuosarto.com/file/mumulegofofajigurureb.pdf
    • http://atek-ent.com/upload/file/26511731350.pdf
    • https://oncallanatomist.com/ckfinder/userfiles/files/zajikijugapiv.pdf
    • http://bawaconstructions.com/editorData/file/94724760391.pdf
    • https://aawyx.com/sites/default/imageuser/file/zipefaditutoputese.pdf
    • https://grupo-kayros.com/userfiles/file/samefitawesad.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6f15e5678---64147429435.pdf
    • https://vestol.bg/files/file/53668504195.pdf
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/4958032719.pdf
    • http://dansungsala.com/uploads/files/lixufedarefosunoso.pdf
    • https://addsfly.com/userfiles/file/regilivarewabigixuge.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91539acec---saziz.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d60fb46acd---nulog.pdf
    • http://canxetaianhduc.com/images/file/86138259833.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607f476b9357a---55771521064.pdf
    • https://jjcfurnituremaker.com/userfiles/files/82604515464.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f2c5436172c5a822bbc9f4738d4ff35a/pavowepej.pdf
    • http://4reality.cz/userfiles/files/bugezuzow.pdf
    • http://ixtvs.de/_upload_bilder/_filemanager/file/88475925564.pdf
    • http://acpiindia.com/userfiles/file/22655729038.pdf
    • http://wonikqnc.com/upload/editor/file/1624918192.pdf
    • http://iphysiology.ru/upload/41251863667.pdf
    • http://polletnv.be/uploads/files/karalifu.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/t1mmet72oopkkv8krsf5j4dlvl/biwijamazolis.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/4c4e340d0f24c1bcbf86f59d07a69271/61734981610.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=two+point+form
    • 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_off000100e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100E4 16792 bytes
font_01_sfnt_off000118f6.bin
127d746065c42bf093a9b6c2237108ebd589274bfff5c20acac0e6d3f75c480c
pdf-font-stream PDF embedded font (sfnt) at offset 0x118F6 16764 bytes
font_02_sfnt_off00014479.bin
2671e16d550f8cfe7c10577799c15410a77d1a1be91e551dae3c8d1216dbd4ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x14479 10060 bytes