Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d316f28de0f6d89…

MALICIOUS

PDF

74.9 KB Created: 2021-09-03 21:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 403445524cdd43790b49d686738b223d SHA-1: db2e7f7793a0f87116c3613d3260751f024be3d6 SHA-256: 1d316f28de0f6d894f7729f328942b3788494117cbd947fef0d883084d515a91
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous links, many pointing to compromised CMS uploads and disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but likely serving as a vessel for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://congnghethucpham24h.com/upload/files/jojadi.pdf In PDF document text
    • http://canvangdientu.com/images/file/22367446573.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860e9a6b720---74420803167.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/s3f2k00bbot211i7essk9h0bir/27089708124.pdfIn PDF document text
    • https://anjingliar.com/contents//files/65458937060.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/pejubarizojurakeromalok.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c758fd2839b---rabupozuvedugav.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/45607722517.pdfIn PDF document text
    • http://abnicum.ru/files/file/gukod.pdfIn PDF document text
    • https://eternalbliss.net/file/zifaranadakorarobobi.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/c6f02786329a721f76e831674096aaf6/80990882369.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/nirurixetatubofoniritoza.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/vadexupopuxek.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/jidazikanivokex.pdfIn PDF document text
    • https://comfort8889.com/upload/files/gebozu.pdfIn PDF document text
    • https://wipaphun.com/UserFiles/File/gogimodisiruruvemizo.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/ghumuvnhf0mubu5ilc6hdojqi9/66389767423.pdfIn PDF document text
    • https://starbox.fr/img/files/33253062996.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/famurileziragun.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/talofuxotubaselimulikexow.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/tinowatazedajadukaw.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a5ba92b87---vofiduvuxuleludadasen.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/74257396517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=meaning+of+management+information+system+pdfPDF 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_off0000c594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAB 10900 bytes
SHA-256: 106300024445b895bf580c049570cf2a4178d687af01b5093ebbc0cc831c8ff5
font_02_sfnt_off0000f6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AE 15428 bytes
SHA-256: 5ff9fb973446528498ed6ebacf0c64b7e51c02606cd1f9957d95d6a1545afcde

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