Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45a20216b634c79…

MALICIOUS

PDF

95.4 KB Created: 2021-07-20 04:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3c8d38685654ec17dfe213e1f6e11678 SHA-1: 49b5a278a9d5e01b6906c1fc86e5a94e677f1deb SHA-256: c45a20216b634c792b49d50fe7ecf1d95f1ab4af1c38a56ac18c899dc21ab1c8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous external URIs that point to various websites. Notably, several links lead to compromised WordPress upload storage, indicating a potential distribution or hosting mechanism for malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues about its intent beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://tvsporedi.si/vsebina/gizowatunomogi.pdf In PDF document text
    • https://adasms.fr/userfiles/file/norawimalibawam.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/tagopoparedirivowa.pdfIn PDF document text
    • http://vickerycarpet.com/uploads/images//files/zunitamemaduvik.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/papikodupemurukajemi.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/dudobokigo.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/wuzesuvapekafozav.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/92617742587.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/jafabuduwudilise.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9404bf308c---mumexalupenok.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/be30176e5a38ee3cbc95f2fc082fa69a/2128080569.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4b03e5565---92835768915.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/gilepapatunekanaz.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/05c67a5bb940047277cab77055cfd6c9/97621848036.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/bbl842vejrfl0gr80mb8la4bd3/pajojazogetuseveretux.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160afe7f5b58c5---futujedu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb18be07bf---fukoxefegozuged.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ee363mpdojipidodtvcac4nd3d/lexefixaxositumelazozejir.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/a4f9c516d655faef32ce3481fe2d1700/mewiwagomosatasipolomam.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160785bc747481---69482409564.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/namevituvasajo.pdfIn PDF document text
    • http://eichler-kammerer.de/48821403576.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/10666316996.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/86243522067.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=best+ninja+movies+of+all+timePDF 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_off00010b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B08 20072 bytes
SHA-256: 371d0cc5251835387583c6bc85135ecc319cc4e043da7ce78b2dc0f6d60b7d8c
font_01_sfnt_off00013e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001567d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1567D 10524 bytes
SHA-256: 5b2a1e8526f0500fa38ee60e199f229ea395742e52b13ba61178a775301c2e74