Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6959b437f59b36…

MALICIOUS

PDF

83.9 KB Created: 2021-09-01 17:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd765ec456b89dff444fe34563d75952 SHA-1: d6662f13eb191d11046521a4598ed6a7b54663b5 SHA-256: ff6959b437f59b36702239748e6c13ed31917bdb09bbc7e650e59f06193345c4
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. The 'SE_CLICKFIX' heuristic indicates the document may instruct users to execute commands, a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 http://cleangroupbd.com/ck/upload/files/nogagolaniveluniz.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/5a085bf64d0d2992bee3aa842f489158/rubozus.pdf
    • http://stonestudio.pl/files/upload/file/42728333219.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fc6c3370b---80831588263.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/7266ab3ae5c5ba527e45a05d500ad6c3/misirisesimekimodoxeg.pdf
    • http://2478.ru/admin/ckfinder/userfiles/files/mikivawijopitefetug.pdf
    • https://coebmsf.com/userfiles/file/zorujiradaxovirateteb.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607236195ac53---luripenavobowotasulejewir.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6143ae478---58829496593.pdf
    • https://floridainvestment.cz/files/file/4193313006.pdf
    • http://chipublichouse.com/ckfinder/userfiles/files/jumalaxizobelaxozevotuxo.pdf
    • http://rolmech-strzelno.pl/Upload/file/japagiromajonevaroj.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/ae0dcab443c4a737f3a19664dc18c298/44727191593.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607af56521bcb---wozefojeju.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609f371daee5b---bedijezu.pdf
    • http://mmckno2010.zkosuchdol.info/files/25707918414.pdf
    • http://stroi-sistema.ru/img/97876545428.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/231dfeda14200ae1f448d0de6d3bd20b/6291890705.pdf
    • http://mrpokedb.com/uploads/files/1446610149.pdf
    • http://geometrabottero.it/userfiles/files/44309194733.pdf
    • http://crm333.com/documentos/file/juvub.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/12a6ac4fd0a184ab2d32a1d1d16e36ae/69328613904.pdf
    • https://aventura-agence.lu/userfiles/files/1419570831.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ethernet+cable+unplugged+fix+windows+10
    • 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_off0000e048.bin
7bb3aa7d2e7cfcc6c680a9831ee6aa76555e4a1ce4976d74c161864a84da5059
pdf-font-stream PDF embedded font (sfnt) at offset 0xE048 17536 bytes
font_01_sfnt_off00010dd4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD4 16792 bytes
font_02_sfnt_off000125eb.bin
fa5af1d36c3d2ee918c9313aa383c0a5934dd961cbafc63e81cf80d4f8ea876f
pdf-font-stream PDF embedded font (sfnt) at offset 0x125EB 11484 bytes