Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4792ad5538a5de3…

MALICIOUS

PDF

81.3 KB Created: 2021-09-21 01:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 723b215e69f3934d005dc6dbf365dcf5 SHA-1: 827c241d19546d30e1a5fb302cd6280c4301e016 SHA-256: f4792ad5538a5de3e39775b2041ed9361915818926629b120be1379c2c450c34
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. These elements suggest the PDF is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • 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://archism.ru/uplcv?utm_term=put+music+on+android+from+itunes PDF link annotation
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/vawenebupaxewuzesoji.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/9913142355.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/luvakil.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/33486815907.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/32999829768.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/verepoje.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/61264990258.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/puvixuzi.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/44719496619.pdfIn PDF document text
    • https://phuquiland.com/upload/files/45938163815.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161477ae12f678---nepejipakaxu.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/45509449970.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/nevewekijusigajuzuwa.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/xaxanefikoravafabobogev.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/49917489586.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378c5bedefc---beleziximemaxupibu.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/wakevukuriv.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/181448118410.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109181609087942.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/pakixemuvozapusepun.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/smsj1agu6a1nip1h3b0s64d8ro/21158056238.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139945c78403---13351296501.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/70262202823.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/9278812571.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/jitevesorudobesaganubawe.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/90641275218.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_off0000d923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD923 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13A 10692 bytes
SHA-256: 63130e2c8438ce5727d4c541dfc5a65cdb52b9d210c78527c6c4043013040e14
font_02_sfnt_off000109c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C5 17612 bytes
SHA-256: dce05d6e197f2325b66e480b7f8abca8570ffa41251c95925e047324e0918908