Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a571bb3e3c8a238…

MALICIOUS

PDF

71.0 KB Created: 2021-09-20 02:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ce97e0ace30386eca960d57a4d96ddbf SHA-1: d8ebaf835c214ab0789b52a8d865333d087d0c72 SHA-256: 7a571bb3e3c8a2389942737a5150fd3453df91d8e900332498248810162350ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://jjkxmy.com/upload/files/202109101151501635.pdf In PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/84530207889.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/jipalefavu.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/jizokiremu.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/12196231738.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/pisomo.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/42265176395.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/59351989305.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/69974221221.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451300ee27d---xemebobizoguwol.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/xavevizivuro.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134e95729b48---tojanadovuzi.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/77500937108.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/merupin.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/53f8d79b73d01c29034d3772eca94f28/wogamazedalijadewofisono.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/76872018499.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/fasiwaf.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/sawonovojesefakevil.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/pofumumuxibo.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/fukogomuwepubilovab.pdfIn PDF document text
    • https://msiutilities.net/documents/diguramologerefawewodi.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/0f62cdb19c2ff75e0e6c2d942427cd14/42100860313.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/vutigevenedetinufagofum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=efootball+pes+2020+android+gameplayPDF 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_off0000b4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D5 11320 bytes
SHA-256: 18f36c90ae87a1cb65bc22cbfcab2301012d7e1291c2342b57c4119b15bb4257
font_01_sfnt_off0000cf0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0C 15504 bytes
SHA-256: 7c57579a6824c88f416f40585ac45754ce4024baeef2ef2cd660b4b005beaad3
font_02_sfnt_off0000f62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1