Malicious PDF — malware analysis report

Static analysis result for SHA-256 30ef3c343f73bb93…

MALICIOUS

PDF

80.8 KB Created: 2021-10-05 14:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cf3432684cef0506a2f994b9b69d3f99 SHA-1: d74e039f7967efc4c3908936d3e2bcad7a5fde9b SHA-256: 30ef3c343f73bb93eca066d283ec90b77fd433411851ae994700527116dca9c4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's primary purpose is to act as a link farm, likely to distribute phishing content or further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://huntic.ru/uplcv?utm_term=d+letter+things+name PDF link annotation
    • https://fontaine-eva.fr/userfiles/files/namebezuwonaxiwop.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210928_8EE6FB3981ADA8B3.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/mm1brmqt0496n5ue6b8r9qmgb6/9457130055.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/15301373949.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f55adcc16b53a828d162494117a603be/71740437961.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/65373629391.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614cad20e50f3---jamodanipubowekomu.pdfIn PDF document text
    • http://trevorhannant.com/10888263446.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/d94a18d6735cb8ebbff8df13e6618e8b/bulumomikozinikomuxodorif.pdfIn PDF document text
    • http://haki.tincorner.com/uploads/files/51414785152.pdfIn PDF document text
    • http://annuaire-regional.com/ckfinder/userfiles/files/14770621588.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/bumoboz.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/padijotenonezoremiwume.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/35751797272.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161406f5aa8e70---sugumad.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/resuzegawigejimerixafope.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/baxobawatumimopujepuneli.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/88424231446.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/korisupesed.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/6774577615.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/24119603385.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/61362115507.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109182208515825.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/56422286490.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_off0000d647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD647 10436 bytes
SHA-256: b35b38aa89ce6fc8d4488ef6941aadda9eb4960b926033104dc0b1304edae9d9
font_01_sfnt_off0000edba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBA 18540 bytes
SHA-256: 8225df7177fb5595f0c8d7d6256e1ad5363d0bbece3cd5416f1a20b491d6246b
font_02_sfnt_off00011da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1