Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f17b41c47c7a81…

MALICIOUS

PDF

86.2 KB Created: 2021-09-07 20:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5b669c2109a3221f67c6ee16b89b69ee SHA-1: 63ba35f2fabde8ce1bba2a032e371cd76657cdee SHA-256: 44f17b41c47c7a81d303daf2fc4642dcd3492aef4d81df05ee70cbfeb702feb2
176 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Multiple heuristics identified numerous external URIs pointing to compromised WordPress upload storage, suggesting a link farm designed to redirect users. The PDF itself contains obfuscated content, but the presence of these links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd865be60ee---xadonanaxasi.pdf In PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/3976736608.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b13f68bc9---20140992788.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4849b62d1.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/71129978005.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d9af85e41---zonegide.pdfPDF link annotation
    • https://balajitutorial.com/admin/userfiles/file/bivowufevalakolawuzojazox.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/80150896645.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076215443afb---48561504189.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/0b5fb4aa6a0be481e79389b23683da03/dizusuvewupuxaguver.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/54653820572.pdfIn PDF document text
    • http://ty-int.com/files/files/34886545939.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/51359514593.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118aff858708---lofubalawitewewoxe.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/a29ffdc0cebf0463722e6887625afa8c/tofepemovolasuxonisimefe.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/29294982629.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/4f7af224a71f15e5a07af84943bff292/sunajilas.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16082cac0a7f6f---11376624258.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/luzev.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/tevisukapoxope.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/9188648255.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/66744890530.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/1838462290.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ad4d50911---85746696930.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/40e81e202718cb59cab5e2e30138b3b3/85970412929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=australia+us+free+trade+agreement+pdfPDF 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_off0000eb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10387 10800 bytes
SHA-256: 3530957bb6eee214cea801ced97746c482299f44cda2ac81c707c4affcc389ff
font_02_sfnt_off00011c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2C 18040 bytes
SHA-256: e26c11c2f4971ee31b4737e301d6cdaa69d8a1d59251afef7b9f06e21998c997