Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f629e9e73e4341…

MALICIOUS

PDF

84.8 KB Created: 2021-09-22 11:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 331b71c892ecbf86a00901afb08e7380 SHA-1: 5016193737456260f0b2eae2e0cb01d4ed603730 SHA-256: 50f629e9e73e4341b466b8e6d70d99152ffae337446319183f0d458057b6c94a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=android+register+activity+lifecycle+callbacks PDF link annotation
    • https://stancijanegrin.com/userfiles/file/momeserezametiguwoz.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/9363621564.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/72451168286.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/20125709225.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/nefipomujotinajikelux.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/borilemolenerivavaxube.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16132fe9eb8f97---97819625783.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/derika.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/vuxoruvu.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/82554507018.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12847634749.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/161489e996730d---vuror.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/vopurimiserikugeriwofa.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/23025155497.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/54808543433.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddef438d6a---24145375494.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/70868628919.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/94764565425.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/77027718648.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/sanuxoxijotaxojesunojiliz.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/30400643454.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/22757316279.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021090500280373499.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/28101566254.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/gujopivijajumil.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_off0000e6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CD 11044 bytes
SHA-256: 48d2bd546fc145a482d50d1f78744727a5e00a8975dc9ad640af7bb81c66cc40
font_01_sfnt_off0001007f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007F 17220 bytes
SHA-256: 8a223fd8d5d4b7a2fb21072da130a658e79eec1a8788624db457e0f53bfaa0a3
font_02_sfnt_off00012d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1