Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a67d3bb5012626e…

MALICIOUS

PDF

87.0 KB Created: 2021-07-02 00:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d193d2842c52ec9a9176aea0d4fdd3f4 SHA-1: 25b5904aed23b7cafc420654fe42f392f3202c98 SHA-256: 7a67d3bb5012626e5920f7f03ad5685bc1803ef3543bfdf61499524db178cb14
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm hosted on compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The presence of numerous unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/208e11cebdfd827eb4744586719a18aa/vefenafarinosareb.pdf In PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/nofididobekirudawid.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079d93334dc8---buvorizabobikerikivulo.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/96066124794.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/70755924058.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb357e8038---49695603905.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75dd7cd46e---48205587702.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16075adc71f92a---6284638068.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/42596990842.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/76650487792.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/tedelemes.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1608bafb772eed---milojile.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/9bcd1937bd1f7ecb95b5bf6b031117dd/tusuxabup.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/62212787797.pdfIn PDF document text
    • http://usmleworkout.com/files/file/69109322970.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c850c3049fe---tazapupomuwikax.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/81762954117.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/20514513070.pdfIn PDF document text
    • http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/1037021491.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/70397308106.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d49aad13b---valamakigezor.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/76772390540.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/rpj1i925am39g6srokcn2m1tgt/16102639435.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719faa200e9---59754987923.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e32ba9245b---86323926449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=introduction+of+tuberculosisPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CD 10500 bytes
SHA-256: e6eaf7011e9c9db86803ed5cca0cb6b7050a0a582fc34279ab49254170182ffd
font_01_sfnt_off000109c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C9 17296 bytes
SHA-256: 620a56187e7d3b58a02e117726845fd14bee3915547f4029ff6bdd34593618a9
font_02_sfnt_off000136a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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