Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f98c63c54e84bf…

MALICIOUS

PDF

74.6 KB Created: 2021-09-22 09:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0639292e69f6d12265330ae0442fcbf8 SHA-1: 021ed338babde7e3d3136e39519d2215d865f388 SHA-256: f1f98c63c54e84bf15de9aa9198edf304ce3c8dfaa32153c79790459c830d977
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites, some of which are hosted on disposable domains or use UTM parameters suggesting a link farm for SEO manipulation. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it is designed to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://krisoc.ru/uplcv?utm_term=asphalt+9+apk+free+download PDF link annotation
    • http://palirna-frydek.cz/uploaded/file/43004381063.pdfIn PDF document text
    • http://ekouklid.eu/UserFiles/file/gemeporuxozobodor.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/7cc7167e13d87e2746338aa88863c5e1/xejotuwegoteg.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/91583152569.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/xasoxisafemimapofigevubig.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/97535345133.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161497122dc001---nezujujev.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/12c5fba02d9969d2a813c3af92b61895/77506198580.pdfIn PDF document text
    • http://scsytech.com/upload/files/68748189822.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/kimozituzedofowupapulasex.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/58062860511.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/sadurinusukudunuletijaw.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/89eeffbd8e2dd90de33af812a9847cc5/79585957130.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/wiselafo.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614ac932b7b76---riselurudumubenegibojugub.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/1268346948.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/98321925331.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/12722806808.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/rapevomo.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/72580915885.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/3i0n4si59kbsgu28lp0aqqbv0v/87499106617.pdfIn PDF document text
    • https://rjpexport.com/files/gepopanigoxuvojevawepazi.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/43931984054.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/99781010022.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/paxebopabab.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/dewovo.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_off0000c061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC061 10832 bytes
SHA-256: fb7be6f70137ed8efb1e78e8f87097e8676a233d88f4564363bc3838ff4a788f
font_01_sfnt_off0000d97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97C 16992 bytes
SHA-256: b07f7968cab330200be1b0e0a72fc6ea2c09ecc95b03a3f7bec6320670a6d163
font_02_sfnt_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1