Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b1e7ba4a7faf52…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 09:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 64e6aeec9f193f7be68ba055c9c977ef SHA-1: 7dd8c9318e393bb0a16de65d5c7ef07be220bd6c SHA-256: a1b1e7ba4a7faf52ea10c8ed9f8d8d7c89ee2403d686182296be311cdc9604b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://garglob.ru/uplcv?utm_term=dream+league+soccer+2020+mod+apk PDF link annotation
    • https://emotionalgift.com/ckfinder/userfiles/files/50456463857.pdfIn PDF document text
    • http://cke.hk/userfiles/47207544869.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/91808553393.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/duzolamaraseworimobobiwuf.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/86827028886.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/fogoge.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/50661486258.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/6366440550.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/zofiwazowodajupewafepazek.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/a90sh4mjdb4ke7pvhl8avpaeg4/97015237395.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/94283755618.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/78527305758.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/vizimofawepititaxewewaju.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/61934666600.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/jodonizibuzotitebuwam.pdfIn PDF document text
    • http://mq-water.net/upload/44089971951.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/47819623662.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/92352722014.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/11007594943.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/75756088973.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/4uk7ig2ncc425t40m66pavbs54/jikusamuxexus.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/85633076127.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/30296715509.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146aa9522baa---21433363458.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_off0000d466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD466 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7D 11000 bytes
SHA-256: da2275473f397b5d10472fe215fdf0777744fab96e10b26920924b065d8823cd
font_02_sfnt_off000105ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EA 17784 bytes
SHA-256: c5bde7b0df51b0df3f8cfb04157a2ce54f4daab570ddd382dd888251c6adfdcf