Malicious PDF — malware analysis report

Static analysis result for SHA-256 651dcee93e7f7e2f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-12 12:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d05b15c08e8c31bba6add3b8000cea2d SHA-1: 04f4a4e016ae22fd526081b48a508677b3c4c0ba SHA-256: 651dcee93e7f7e2fc86501e5d66421196171d20f2bccd89768dfa5051048e35d
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, including a link farm hosted on disposable domains, which is indicative of a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • 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.
  • 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 http://bilafafafa.com/shopadmin/upload/files/72882013218.pdf In PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/25de4ece8ebdbadf3f19cc45fbaa1fa9/timitaputoseboloxaxixubi.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/56475345901.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ac48b7f1---59742531465.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ludope.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/zazozazevunobegipefek.pdfIn PDF document text
    • http://zuche0551.com/upload/file/36253604701.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/3277782362.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/xasite.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/puvawulexes.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/kimusabetazu.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/42241851257.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/donuxetaboweki.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/75361038922.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/sezadodeta.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/semexefepisusodosedal.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/7002665737.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/30632769350.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/87218045132.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/zupivute.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/dameperogavuvomapezuw.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/xizukemepulizitudowabupex.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/3324168257.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/80421639571.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/k0d5hm2mv7rof4b1lbiam99t62/xulaxozirew.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/29743231698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=vidmate+software+free+downloadPDF 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_off0000d483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD483 18444 bytes
SHA-256: 4404b062a17cc2a19fe2975d25956d191ff4bf9d6b12d98b25a1a24a405549dc
font_01_sfnt_off000103c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDD 10572 bytes
SHA-256: 1b239d0c2b9ab2390f85f42f424abb4a24f3b3b870f8e6ab20eb36935b10aff7