Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a0b39172f93c5a2…

MALICIOUS

PDF

100.6 KB Created: 2021-06-28 10:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ab35d1f6edf251aebbe9035783e0d691 SHA-1: d5012ac382ee1e4d6f18229029af8f1d1b483ca4 SHA-256: 9a0b39172f93c5a2168fc2300fa241f01246f67ac474e87101b66d87ab850813
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple external links suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/aj1mci8p1h9bvlfa5e656de9sd/juzakufomoxexezupurufup.pdf In PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210621_FE9076D7CE4A58B7.pdfIn PDF document text
    • https://mimpishiosatu.com/contents//files/sivesiweke.pdfIn PDF document text
    • http://ccsl.asia/files/66745138033.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/rovogepufexoxesedimibeda.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/pilufixuxigenevonoresotu.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/45300004472.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/c546c82353ba5c01c3191ed4dc7e0297/6665282302.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/42230222194.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/08a31a162bd373902ba17008a08e5844/96612863491.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072947c04ffa---4024207862.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/dq90lonki6c79mar190qk1cu96/88807958862.pdfIn PDF document text
    • http://dallaslandscapedesign.com/media/files/17542572618.pdfIn PDF document text
    • https://kopari.hu/files/file/kewukeponeseton.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/jefupovepujopizom.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f19c76900---66209682347.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/b4f4bd46bc62a29606973b633ba7ba3b/94088938904.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/11532088581.pdfIn PDF document text
    • http://lueckerreunion2020.com/clients/e/eb/eba09433058400eda594a485f9004317/File/debusa.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/u3hg7thcn80c5oiu9h1jfpur54/48360725825.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/5b60c78b3e00d2e6f912d52ea8613b30/pasebanevonopusenek.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa11a87d0d5---dejeweregubipejafuzi.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3486a0617---valipobegido.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/246e27713d1fc0ed606d1d4687e680c8/gojuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=well+known+by+self+and+othersPDF 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_off0001245a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245A 10784 bytes
SHA-256: 97b33878e39e31982fde3b9a1017fa0f26dfed98e4c2e2cf9d5b7a54179f880b
font_01_sfnt_off00013d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3D 18404 bytes
SHA-256: b15060009a4ac5acf2085e8822622cfd4ac6a2beb62195dd0ad95ec15b8c9f6b
font_02_sfnt_off00016d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1