Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dcccad338655384…

MALICIOUS

PDF

88.5 KB Created: 2021-07-21 10:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a8821b485943169f5f67936f3be410e6 SHA-1: f3cd3c19cd2b0feb36fa279fda538d7793ed6547 SHA-256: 7dcccad33865538494063b1ba121222d3d5a521de3b34ca0f4712c1fb8af936e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and link farm heuristics, indicating it is designed to redirect users to other sites. Several of these sites are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ouhkpthaa.org/userfiles/30126171708.pdf In PDF document text
    • https://erdenetpost.mn/userfiles/files/73606368990.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c914972dad4---77130890268.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/89247580384.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b79bd69adf5---fozafaloxefixidosotagut.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/bfs6cg65fr3e9p3n3ve2hotduu/datutesorajoloziduvunu.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/48e40g158s79af8cug3sg38ts5/29505023056.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed2a211a1e---29650163526.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/451872f1107cdb2d65405f2669f66b96/gugejasi.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/radidajogajiruzowobel.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e982ed26133---xezuninubigaxupo.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d04fee2b6---42552589895.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/tkgj070ok4f9mfnrgc4af08ei7/fofilopajonakoruva.pdfIn PDF document text
    • https://petala.gr/userfiles/file/76558968506.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/74827270679.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/giodcsf6fmnl91kjoujuo7epb0/fonodeze.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/84632436503.pdfIn PDF document text
    • https://areicon.com/images/file/gegusatoranazige.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/binoxamedumi.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/zufobizirewik.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/viwesajal.pdfIn PDF document text
    • http://calzaturificiocatia.it/userfiles/files/63484398777.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/1779560041.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/sedipexaw.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/31380030640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=who+am+i+trivia+questions+celebrities+with+answersPDF 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_off0000f297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF297 11028 bytes
SHA-256: 64e93197fd69abe491a28c84990144c9227d860759789b73d779e9081ce0f68b
font_01_sfnt_off00010c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12434 17756 bytes
SHA-256: 226a48d43846d5b18fe031456c9f5faf98fe3107185e8721da440f0ef6ad39f4