Malicious PDF — malware analysis report

Static analysis result for SHA-256 49ac7a9a839692b9…

MALICIOUS

PDF

83.6 KB Created: 2021-09-07 04:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e86fc355145f2029c315e367eebc278e SHA-1: 305d6b6a85b6444572e06b1238a60d394de58177 SHA-256: 49ac7a9a839692b95a28d52009e2f74e72cae097f03997cc8edf039009b484df
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The file contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://tjpapigroup3.com/contents//files/32495614322.pdf
    • http://auburn-companies.com/userfiles/files/sanabelafekugesekuroru.pdf
    • http://wildzipper.com/clients/wildzipper/userfiles/file/16794160665.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/f4ea471abda6e219115e7e45f13053be/76168518599.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2d5ca01e2451bef90d6441cd87ededdd/lemimukutuga.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160809fb7c00f8---duxoman.pdf
    • http://bona-agra.pl/Upload/file/fisofadumonasexajij.pdf
    • http://dienlanhlongan.com/upload/files/6853841340.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/02f7804b0902cb451066cf7b2924fe16/19482272004.pdf
    • http://deficanderel.org/clients/6/67/674a09facce11b7629d390eef9534ff9/File/zowasatetijidusu.pdf
    • http://watthaistuttgart.de/userfiles/file/kaxunap.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16203348037051.pdf
    • http://alrehabourhome.com/userfiles/files/84647257804.pdf
    • http://friulanapanini.com/images/file/pasapevaziwiboxujobewor.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092dc11ae2e6---20684358156.pdf
    • https://dukra.sk/editor_uploads/files/fowamu.pdf
    • http://nesthomes.in/userfiles/file/nikujilexatodi.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/0e321979f09add8ea49f972e2f64bca7/97196661214.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135aeefaffc8---71716699899.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45fdfd5035---53215985753.pdf
    • http://thedewakohchang.com/image/upload/File/epelegurelebimuzosep.pdf
    • https://kisikana.hr/userfiles/file/77784045609.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=map+of+ontario+cities+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1db.bin
e23cbd5c594d2ad186657ce38306e3d4eab3f08c82b2f8f5bfdfba14a74f50f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DB 17916 bytes
font_01_sfnt_off000110af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x110AF 16792 bytes
font_02_sfnt_off000128c6.bin
ca3754b1e56c2608f9c4fdcac8d5f14f1f392deeb47f87ee62b339d997d23d97
pdf-font-stream PDF embedded font (sfnt) at offset 0x128C6 10560 bytes