Malicious PDF — malware analysis report

Static analysis result for SHA-256 5019dcc523301d89…

MALICIOUS

PDF

86.2 KB Created: 2021-09-23 08:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 91d460530efe936ffa820cb6623a10b4 SHA-1: be08630847c6e75c0e8ff0c5992ba46c49dcbe55 SHA-256: 5019dcc523301d8911263c3f0039d2eba417153a9f9ba304c980e601e5cb9dd2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://am-assets.com/aom/magnolia/userfiles/file/52531280224.pdf In PDF document text
    • https://ochronaskory.pl/pliki_user/File/xopufodikimivone.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/57894970715.pdfIn PDF document text
    • https://datawire.gr/files/files/40770320142.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/32260306404.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/06/fabubeziki.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/44184464793.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/7023488974.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/jebujizititawimikemiwifet.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/repaleputipedorok.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/d4551c733061dc24cb1c181e3ef4f5bd/bizejowukipetagarus.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/65367859521.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/jinidefuvuluj.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/kivamesafopud.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/97359464259.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139ce17d2169---kawik.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16138c6ae46eef---kujutogagowolopetari.pdfIn PDF document text
    • http://sinostandards.net/upload/files/24215513868.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/sovenaguno.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/78733163500.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/nekuti.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/74194826173.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/nanutera.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/dotofozumukefazu.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/vakutukizajilorovavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+upload+contacts+from+excel+to+android+phonePDF 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_off0000ea11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA11 11164 bytes
SHA-256: 81931bf846b246f3c9d2f712492e22b2ccacd5980972e81439b14a59e8229c78
font_01_sfnt_off000103fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FA 17668 bytes
SHA-256: 33e35fbcd9b9fe591940591e7140aa23fba1ee6b13c8b3c6d3fda27046f88eec
font_02_sfnt_off0001322d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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