Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f3579afb0be6f5…

MALICIOUS

PDF

88.1 KB Created: 2021-06-30 04:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 654dd9356dc0508bbfd48c884b29f47c SHA-1: ba48d175d81bc81b407370342ef4cab51c885d66 SHA-256: c7f3579afb0be6f558453385427047c79076704d3404be959c511aa419177b9a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The presence of external URIs and link farms suggests an attempt to leverage compromised infrastructure for phishing or malware delivery.

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://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/cf4e595ecf2b179d10a470372f6fa84f/89380234281.pdf
    • https://a2designbg.com/userfiles/file/82829223115.pdf
    • http://global-insurance-broker.de/downloads/zunovovuleduvesotuvelo.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/giuk11o4sokboim8a5lg8pg773/tujetajebiza.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/v028i6417dpmv8r4tcaab01f1r/1648292360.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607579d975576---95768019393.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2655d66b71---doganikit.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16087f946d4539---petetogale.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf4de6931c---vibalesipezikujoratif.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7a79e9e8---goxolijotulejerugulamuxa.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca4b824399---96174582722.pdf
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/poxilidivobibowom.pdf
    • http://goldenbaycruisesagent.com/userfiles/file/60806773623.pdf
    • http://solarhomepage.ch/fckeditor/editor/images/file/tikavuxepakipedid.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f452eb980---64575018524.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6aa71ee6a1---nirafulaxepugoke.pdf
    • http://hoanggiaphatland.com/uploads/image/files/fowizo.pdf
    • https://superpart.com/files/32402460041.pdf
    • http://www.puhito.hu/uploads/ramalemumimevusawoz.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/d9af6f6886185b6faa7961c021c23465/61973131451.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/et24u3j4la33aa17vvq0ft75ai/tunusageweza.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/defilog.pdf
    • http://brookhavenclassof1967.com/clients/0/0c/0ca802fc87877f8c548ddf85495caeb2/File/42319934090.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c4aa7c04d088a5eaa8ced5eab5fe8ba3/26062601560.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/d93124a3c549714e817550de9d86f31f/5698850597.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=menses+cycle+days
    • 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_off0000f539.bin
a4acc1b61599f87f3b43250eecd6305466448316c3630e2544a68e0a8d3018c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF539 10060 bytes
font_01_sfnt_off00010bbd.bin
955273bbf6f67256ddc615f52e011bab782f1f2d32e98ef1aca53752cfc4d69a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBD 18104 bytes
font_02_sfnt_off00013b34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B34 16792 bytes