Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c88c545b04ad54d…

MALICIOUS

PDF

95.3 KB Created: 2021-09-03 21:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c04739a39c9237cbfeefa9833541342c SHA-1: ca4f201388e76f7d329d756c3a9bbb3cdcc27b84 SHA-256: 5c88c545b04ad54dc136e07fb43b9cd612e6b1d520eb9722c22dfd3051a3885f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=the+book+of+henok+in+amharic+pdf PDF link annotation
    • https://digireg.at/upload/nowesibezubuxedogat.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/7gveek2mb9tlvprpc0dr6uerg0/70548983632.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/zomifopamewuweradi.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/53851085722.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/7187dd4f02deba923827a8bc70d8d67f/16445774771.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/34683917517.pdfIn PDF document text
    • http://msiutilities.biz/documents/9694427801.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/53036419157.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/62658453122.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/6dd80215de400b43da1b8e72207a93eb/tadapiwafebeferizoweju.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc8a758812c---88288998790.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/79221630984.pdfIn PDF document text
    • http://sciattella.net/images/file/maferomelikeweberebigax.pdfIn PDF document text
    • http://cga82.com/admin/File/93265856832.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/lepifivadatozufewo.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/tevera.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/kolafufusumanomewakiva.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/b20dc33d676bf61c30abd1698e713b9c/vajinunoponafij.pdfIn PDF document text
    • http://tchid.net/userfiles/file/kivaneladituz.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/2b78cjvm1fkr0m6ra90dc37hqj/mebevebuveloler.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/bawogazotenu.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/zabajeratuka.pdfIn PDF document text
    • 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_off0001110c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12923 10768 bytes
SHA-256: 2cb9151bb4b0bc40e5299c95d544d919c89a0546b0982f974a19cb65a671c4ba
font_02_sfnt_off00014175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14175 17500 bytes
SHA-256: 5a0d7ba5fd12577969cedc9c87b41d594a017018b608b92651954dd12abe047d