Malicious PDF — malware analysis report

Static analysis result for SHA-256 2830e7d02e1a7959…

MALICIOUS

PDF

88.4 KB Created: 2021-08-13 01:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 7de4fec5231a5496ac47b7a3a90d45ed SHA-1: 160c821a87a2abfc62d5c4b4146e16550a831b10 SHA-256: 2830e7d02e1a79592feaf4e350cfff02af43892860ae5d31e482f00fb7aab864
172 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=theri+full+movie+download+masstamilan PDF link annotation
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/46392115306.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a75b3bd8ad4---43515584201.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/larazoposomumal.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/61387412663.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/796c99616a74b6258df2a5571aecb5e9/62073067207.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7212610eb---buniroz.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/59704675497.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/48849538203.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/misasitazamonabupu.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/28114968060.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/vibijexajuxa.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/88cc020528f9c508f277e8d1f9db4c09/fiwaguzezepepagofuboj.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/jenavimu.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/4451161345.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/13443526611.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/60483186675.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/midezebevotomelokakopumet.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/22401286721.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/r0f0n5vn6lbhojillnvs8ndnpd/zidofuzuxofinubewemurizo.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/ziwuganupoka.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/74843035441.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/rimekebipatabitejubovu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/18278656150.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_off0000f711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF711 16816 bytes
SHA-256: d912ca2ee9deaf99a1a5351b25287178c70960ea71a5dce36eeed0456f6c7351
font_01_sfnt_off000122d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEE 10832 bytes
SHA-256: f73ec65e30f91f58b77cbe1f1ed756d8a51ec3794d348ee102948866cf1a2a3b