Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b289b1328d83c9…

MALICIOUS

PDF

70.6 KB Created: 2021-07-02 02:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cffa7770b4e9df9630bf7e67bf26da51 SHA-1: e3cbe63523d158e4ca522112b927383e067b8fcd SHA-256: c7b289b1328d83c93e08b24edfe720e57cf28da7447a9ac446260ef6c2eaf035
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised websites, likely to lure users into phishing scams or malware downloads. The presence of multiple links on disposable hosting and compromised CMS upload storage further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a689e23b21f---42179113184.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/03f42f188ea7273c1846435c77182e9a/xunenalanozepuvinojo.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/02e6d40a9775f2104820a02ddf49d7e8/kizupisepugufofexemuva.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/8ecca420127fcc9edceda6b522d57eec/78846508901.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e9430730d---jefipikumejinujeronotux.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098d874deb1f---58910280425.pdf
    • https://makenie.com/upload/files/55493966715.pdf
    • http://nousgarage.com/userfiles/file/wilitekavaxajifejizegemiz.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b56a67e79---76107994911.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b12ce44e65---12872431926.pdf
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/f4e76f63f0a7a58347fa9d1883168492/32046272787.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608071018028f---lemupufoxogowek.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/3729dc1205ade2ce874d126daa68ddb4/deroro.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/c1d8f56617d856b9ad8be227e492d732/2011487850.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/8f5542456b125483cde988b711d9793f/jupesumemiwezabem.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/120cb87f029d760c94cf82acd3a58cc2/pidik.pdf
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/rodutam.pdf
    • https://efsanepin.com/calisma2/files/uploads/58871654945.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/92d2a6d2ea0f803dd27983735cb4b528/66738357753.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3602d8a6c---86731725044.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/4b27a6e06e12049947ffaa139e69f06d/25947452715.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/24ced1e543cb3362c8e11beb627614b4/42224625838.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160964bdf13389---3708156502.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=logo+quiz+answers+to+level+5
    • 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_off0000b490.bin
d195ac47c8008943e95e87f350488d8500ed4d64957493330f511767f0789df5
pdf-font-stream PDF embedded font (sfnt) at offset 0xB490 15508 bytes
font_01_sfnt_off0000dc4b.bin
81378d08e4527720a15432eaaa7f3910b93e2de5766a7cb1873855d0664b3865
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4B 10832 bytes
font_02_sfnt_off0000f544.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 16792 bytes