Malicious PDF — malware analysis report

Static analysis result for SHA-256 739bbcba19677a82…

MALICIOUS

PDF

76.5 KB Created: 2021-09-16 22:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e5b68d0794f75850f60339d17f72a22b SHA-1: 57de8002ee488b73f4695a3fcc20620121f4df29 SHA-256: 739bbcba19677a828017a58ca505a7b9729186e6d087e4620a15a80670008d83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is structured as a link farm, with many links pointing to disposable hosting or compromised CMS upload storage. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

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://allytemp.ru/uplcv?utm_term=carx+drift+racing+online+ps4+cheats PDF link annotation
    • http://hasadtemizlik.com/upload/file/6005350065.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/visarenuxumasoma.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/39920645209.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/16272411932.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/fukebekewevifunon.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/kifemasabavijimim.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/novutifujowe.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/7938919980.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/zisasex.pdfIn PDF document text
    • http://sakem.org/userfiles/files/67177570216.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/75673751614.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/bunepesametesevu.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6633e5245---60521992705.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/xenafewuzalejin.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_03_13_47_03_6097.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/509b4df56ca2caa7d0bd4c4074eedc00/3368378510.pdfIn PDF document text
    • https://music-group-store.com/upload/files/mizasaxafawoper.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/rumuwefij.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/wawojamuxagexejojotobek.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348feb83739---27471813921.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614097dbbc191---40759024348.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/22173286152.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/5v7fe02egsr7sv5pa8tfrpcoie/gulomimuzuzasilofod.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/fogago.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/20691445663.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/bagesixutuza.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_off0000c53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53F 17416 bytes
SHA-256: 5ab9d7d1039a422f537999439c91ade6c42d45854209060f952a76a17f5c41f2
font_01_sfnt_off0000f264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF264 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7B 11112 bytes
SHA-256: 55590dedebf84038cf333a854146e6ed6a8f818e0c614e84645ec3b8f92b125d