Malicious PDF — malware analysis report

Static analysis result for SHA-256 238a615cfbda3643…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 20:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bd26f4a495c5f2576522afed4875e291 SHA-1: e1556e6069434268904b3b41996ba7f28000efa9 SHA-256: 238a615cfbda3643f9e1c6672790da7e2d11ff122bcb6c062d9c72b492a57b64
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to obscure the ultimate destination. The primary attack pattern involves luring users through deceptive content to these external links, potentially leading to further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/256c8d6e47807d748f26c1f1b74a62bd/88058902942.pdf In PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/lasisavojun.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609e94e1d3348---jatujimupe.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/89170114316.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16102c84043b94---zulodab.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c10146de833---49705409923.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210819020524.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/61838148489.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/38187849277.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/sivebuwozenemajedabidi.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085d1090b6c3---jelunuvidawebotut.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/73514726583.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/35458782579.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/50807652236.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5d3373271---mevekirafapukoforu.pdfIn PDF document text
    • http://teplospectr.ru/images/files/dewapikomuvot.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/fefuwedekinus.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/3864210598.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/bamujipugosaremapidujimez.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/suwulunurinek.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d45e6242c---38281264027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=federal+stock+pricePDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210810/16285250033155.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_off0000e1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B2 18392 bytes
SHA-256: 27b8a9ce6c786c5c5b32243b04de264f32b4bbf2ca64cd311f4fac8d2eadef32
font_01_sfnt_off00011222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11222 10472 bytes
SHA-256: df946d797c029cdfd4de22837774a2f7b8bec3ec8e28052f2cd1b62b6c91e59b
font_02_sfnt_off00012a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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