Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcae350f6a83e2a2…

MALICIOUS

PDF

95.1 KB Created: 2021-07-24 07:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 584212b2602e322a64e1e8daee0fcfd7 SHA-1: d79b5d6624c6d90eb833abc740a2eb1490fc3858 SHA-256: bcae350f6a83e2a29adb6595f34fa6682f06ef1f7268ab825a5a63e4996f602c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the link farm heuristics strongly suggest an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pr039dg712mgiapnjhdvjahai3/83579064804.pdf
    • https://catbasailing.com/upload/fck/file/wipuxojegukis.pdf
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/60626756120.pdf
    • http://museodegliarazzimarsala.com/userfiles/files/77702084835.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/702a99ee7f5e3d4ecc8db19851145a51/rezojafizimoriwodijatakax.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/3q1o393h149oc9563pl3ajn572/23299396332.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160762606ed9cd---zatatilepuzevinexilu.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/n42k0qhcjlqepfnj8jcslqbair/36632570838.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e93709517---12370792460.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/jl7gaslv4hnbkd4rs4j3qk66bb/89342066379.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbbcb2600d---47022495586.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/798fbe7d8d73413bd30973c9367d3014/kidiruj.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c44584786a0---rekode.pdf
    • http://pphu-joanna.pl/fckpliki/file/36601010130.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/b9me2gv24inq078tcd4ahchj77/69630411296.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/787d84dd982ae38ecf5b1318ebb4afb9/pajuzaredipojaj.pdf
    • http://schokoladenfontaene.de/idata/25524015295.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/e5f6d18c21fcc51a034c620fc52a4827/30870627800.pdf
    • https://aldwalia.com/userfiles/files/binapizariwoxinefobedir.pdf
    • http://prestopc.it/upload/file/95540163889.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+a+good+nwea+reading+score
    • 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_off00011088.bin
03f78b5a0efa9c57b13676d223c1d534e339de60a505a4d020f2fe8811d618c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11088 10684 bytes
font_01_sfnt_off000128e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128E0 16792 bytes
font_02_sfnt_off000140f2.bin
b7b0e3296592405b5f950737b9225e453b17c62cf914b04db629468bca9f8811
pdf-font-stream PDF embedded font (sfnt) at offset 0x140F2 16672 bytes