Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4fe2ed5d3350ebd…

MALICIOUS

PDF

95.0 KB Created: 2021-09-14 04:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: abbdc40986d0537dd8fb4b4d5eca3417 SHA-1: a6eef86874742ad7d7412f6e95db1d70367c6e77 SHA-256: a4fe2ed5d3350ebd296399bbbd12a0242ca0194e292aae53d6208a2015241b6b
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to potentially malicious websites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. The ML classifier also strongly flagged this PDF as malicious, suggesting it is designed to lure users into clicking links that may lead to phishing sites or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=duniyadari+full+movie+download PDF link annotation
    • http://dichvuhangngay.vn/uploads/image/files/58462053118.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/baxudaguvunatobulowuj.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/lifafapozuxukadidoxosug.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/fabupidobebifugopat.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f94a9abda0---52959812280.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/dumususadop.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/24008010317.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109090811449894.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/4bb789521a372bb827a68e4536ff61f0/gejugofesisuzetugadud.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e761202d0e---33205909454.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/wusilidabirogi.pdfIn PDF document text
    • http://afslab.asia/upload/files/2118467997.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f3b52efaf---fimuvite.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/xudutipisig.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff032c748b---labegijerupiwerusig.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/jelaxozovozaso.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d50d008e---38344319889.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/13786499050.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/64237676195.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/xovekevojaziv.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/galebojavixejavag.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/8ud9pb0nt7cu5ttbl4uvlj5fi2/2446274634.pdfIn PDF document text
    • 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_off0001102f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102F 17564 bytes
SHA-256: ec5e339baf3bb6bd0677b2235c76d44378ecde97ef9d0644d1db5c6f3b141925
font_01_sfnt_off00013dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000155e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155E5 10616 bytes
SHA-256: ab0e9d28ccfdf2a330e6925509ea60219069b7349a176a5764b963de1b81f49a

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