Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd2c573ead1faed5…

MALICIOUS

PDF

84.2 KB Created: 2021-09-05 00:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 12c323c020180bc29c3fa7a076c4c974 SHA-1: ca66dc5d3f9a386c6c57103aa2dc0912a75b15fa SHA-256: cd2c573ead1faed50366496fe7cbaa857aae1d44724293dd7e4e1ad522665ee1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it may leverage embedded JavaScript for redirection or exploitation.

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://inwebjor.ru/uplcv?utm_term=advanced+english+communication+skills+lab+pdf PDF link annotation
    • https://haisanquangninh.org/data/dulieu/files/65110586652.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/3688ee79e6dfafa7ba5a569c4428858c/kasewefejibizaziro.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705edb5a16a---bujeziliba.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771a6f4b39a---pelozixopisesi.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c19008e46---viwixikubarigo.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/pajaropogewabiwoxuwumu.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161006fbf25b68---73530081657.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/65435174906.pdfIn PDF document text
    • https://unosms.us/userfiles/file/gagonigosusinisizupixe.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/74706181167.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/wubid.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/tivanogugobujefuda.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/19281255618.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/56806225199.pdfIn PDF document text
    • http://charivne.info/images/file/gigeratunalaxidifeti.pdfIn PDF document text
    • https://o-dance.com/upload/files/95464232584.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afded529dcf---kigepifimuxedifimoruf.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///94093902493.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-7-31/20210731093551714153.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/35375992166.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b82920d9c8b---93055560147.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/wijelixumoxuro.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_off0000e46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46D 17388 bytes
SHA-256: 5877f20f893cd940456651cfdfd0f0673f49e69b26def6eeec15b3c5a5b0284e
font_01_sfnt_off000110ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EE 11348 bytes
SHA-256: 8def12cf1fc54016d81629f23a20434fb8d7c36f9c8d969babbc16e210cd8b18
font_02_sfnt_off00012b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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