Malicious PDF — malware analysis report

Static analysis result for SHA-256 18046d114a5a58b3…

MALICIOUS

PDF

104.5 KB Created: 2021-07-10 09:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9f19eef8cd731a640dc7c1eb6a8f1597 SHA-1: 0fce70a93e1ef01752cdca5481236b0dd760d06c SHA-256: 18046d114a5a58b3a0db3d442070d823732a7fe3cb14ab9955bee02266263cf4
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm hosted on compromised WordPress sites, with numerous links pointing to potentially malicious content. The presence of multiple compromised CMS upload links suggests an attempt to distribute malicious files or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/ebab9866838505f77c218881742c0ece/pujifurama.pdf In PDF document text
    • http://kvbm.org/pds/userfiles/files/22107985894.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609452e564234---kewamopogaxoxukezunesupex.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607097396e578---50076074304.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607abfa394919---woparovapofiwotiz.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160adcb24d96e3---movazezugubenanaduduwe.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/767a329dcbd9a6ebad931965cece7e3f/23684659366.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4f8dac46e1ec5a6ae9e367111d7d7369/dipebatamukose.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/be5400df711480cf6fcb2c9e293817de/15143173616.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/xirigamo.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/90910233100.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f24bebdbba---vizazejujijemirukavujaz.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/60671691726.pdfIn PDF document text
    • http://simonide.org/userfiles/file/fibewudonux.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/xotowubudu.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/92051934681.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a457827ba51d826d829cd95bea9502c3/55806333873.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/77ohhldf08g051lpbdlibtrf13/pejudig.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/ik3voatn8jnppd36bgprru7ah6/rifimiwejesotedafog.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/161bea998aaaadb340d05922c89cfd4b/kodenapolagon.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/xorituma.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/81794327687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=woolf+shakespeare%27s+sisterPDF 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_off0001373d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373D 17196 bytes
SHA-256: 8a2a6d862ef5632c6b072f4f686c28260a41f39f7635c40522000343017b6982
font_01_sfnt_off0001634f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1634F 10472 bytes
SHA-256: 2242ced21f972adfd495cf3898d97e7da0203be3a7c01b3b22181b48a55a75fc
font_02_sfnt_off00017b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1