Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd0460b1ebc1150…

MALICIOUS

PDF

97.4 KB Created: 2021-07-27 09:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c579e64729bac474ef2febe320783c20 SHA-1: 53b59f77f2ec210f7008ff1181e7d3b32d23d394 SHA-256: 9fd0460b1ebc11502b4fa21c0acb38db68f3610b843d21ca3a358be3448bad38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, but the structure and URL findings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://studioscoponi.eu/userfiles/files/5619953643.pdf In PDF document text
    • http://indianaquesters.org/clients/9/95/9573c8d6e108c9729a37356986dd5b5e/File/20752284420.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/74531555036.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c624c0c7620.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/12642281295.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/vagizisebuzaluze.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/tejodefe.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/27614627979.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28dda5226d---64324763590.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/be080658998357fbea21d6a16e0b9f04/27716087447.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/036698464173948cb30781a3cbbed249/83006025259.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d3bc18a67---48121482686.pdfIn PDF document text
    • https://mimpishiosatu.com/contents//files/bikivegitid.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/8cb8c43e9b6d2aae03f73102b37a9800/veridupoluxarid.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/83106714701.pdfIn PDF document text
    • http://melhi68.com/clients/69549/File/fonofugorexawimelujoki.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/dinokumem.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703a2d1e263---96442338732.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fdbbdac1e---51000351613.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/0bb89815741149d293df07611a071e26/37198462011.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/38e595724ed00d839308172e0472e390/53428262203.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16095b17dc8e59---75419043204.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/25208680061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=revolico+holguin+motos+electricasPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD16 18608 bytes
SHA-256: 2f457b58234f890ed59a254e3b4da95411b222a85c5703e6ad85e8775f8e9506
font_01_sfnt_off00012c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C28 10888 bytes
SHA-256: 381a8772b900df944f5fd15c4c114cdbda50a584a8e622a1d6f350621c9a2c30
font_02_sfnt_off00014537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14537 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D48 17096 bytes
SHA-256: 79707878e0c7057dff2f4445941ec81b68499929690d0fcb86f6462e92990a83

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