Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4d993d74d8c6d6…

MALICIOUS

PDF

75.9 KB Created: 2021-08-28 06:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 13e2d57dcc382f0b6d436c953b57b6d2 SHA-1: 07714cf46c3d286c8241bca9d2c0745dd2b0a7fd SHA-256: dc4d993d74d8c6d69dbf4ec9a3c4bb081982a70c725cac2f6156c47c2f3e8e71
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The primary attack pattern observed is the use of a link farm to redirect users to potentially harmful sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://drlanda.hu/user/file/tiwutediwokaz.pdf In PDF document text
    • http://rasmesafar.net/basefile/basefiles/28051158308.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/xoxezosamosekowijakemida.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/85659177662.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/517072964200383791740829a9cfc8fd/43674055013.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7m9ke4u0l4lu96r04fe5hgv6v7/potevusopipomevipuzolod.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/6q1g8hqpj4p506j83lfa540i0r/12838878049.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/22399332778.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160df921955388---rilewojedamufa.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/midakemodolofubilimusox.pdfIn PDF document text
    • http://computerdoki.hu/user/file/42113053297.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/voxukew.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983689b0178---44268335739.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/dd938945d7b40a129cfc38978be7cbd0/zubuzudusiranovajusov.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/bn5oghbggggc8trh38rtmra4f1/78616660374.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e206211250---96348522442.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16073b472b0ed5---nidomawopisosukidutitisa.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/186864fd10e6f7a3b32d172bbbd71b2e/jumakuxapobokeju.pdfIn PDF document text
    • https://luminex.pl/upload/file/benozujiluwuvumadireleni.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126c94cead9b---9503475692.pdfIn PDF document text
    • https://datawire.gr/files/files/73548961754.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/97776968603.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/fupepevubegeg.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160888f1c356c3---62111396543.pdfIn PDF document text
    • https://pasarantogelsatu.com/contents//files/51056824638.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=phenomenal+woman+poem+meaningPDF 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_off0000c7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBD 10420 bytes
SHA-256: db424effe9b41651873f247123d20edf2dca251f96ad288addc8750478546801
font_02_sfnt_off0000f71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71E 16464 bytes
SHA-256: dd8892a4030b8d10b1eeddcf6ce1911745b7ac58b62dad521117893197d3262f

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