Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc6be74782e5e4f…

MALICIOUS

PDF

111.4 KB Created: 2021-07-04 17:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8a5cbbc03035da951c63f40c656c8502 SHA-1: 664718499ded8621d6745aedcc3160d5fd5690c7 SHA-256: 5bc6be74782e5e4febdd9de29b107939807f6ecb259b6ef268bae485773ae168
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, characteristic of a link farm designed to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://amdind.com/userfiles/file/76006469528.pdf In PDF document text
    • http://kibbkw.com/uploads/file/ravudufupatalogawasutobuk.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720bb8f01d1---jodixijovenosavi.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5b7aebdae---88385172426.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c00ec576669---52970687825.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/78180a628e9fdeeb62e9742bd3b78d76/78710306564.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/643996farpmpc60mocqrk6lmsd/guzebofimulamujuxajabifi.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/58b80bd72bfb8707aa8e2c89726d18f3/47473485894.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/5759a8091d1961a724ce7eb10f0d495b/4445016187.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/5c27709efb3f20d1b7ac98795121f506/77899861042.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/ganedukubevaxipebu.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a275a8508---bebotajomegosariba.pdfIn PDF document text
    • http://acril.ru/ufiles/files/48283536349.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2522d96bc---xuvujuvojobafun.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/df8cd1888326ed537ea8d59dd9940b93/94547130447.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/larizefimom.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/16616539006.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/qtu4utk3tvuk6tr5o5meilio95/daxujetadabamekibifopo.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/21436354787.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/0f70knhmu00utvcjg8r1j8dfb3/82251805102.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/girovujoma.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/56c97f0e4035a6037fb1bd8896d361c0/tolabamizijepe.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/paxusuwedu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/4931400035.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/63512826885.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=tina+turner+rock+and+rollPDF 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_off00014aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AEB 20656 bytes
SHA-256: 59282c463100f5bdd7e063d09817c7229abd509d859a93f098762402da7f2378
font_01_sfnt_off00017f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F3A 10348 bytes
SHA-256: 5a9be093ca0acb6510ede14225b56c03eb7ac62d6d4f2a968f605553bcfd6259
font_02_sfnt_off000196b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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