Malicious PDF — malware analysis report

Static analysis result for SHA-256 40520ee53f734faa…

MALICIOUS

PDF

121.2 KB Created: 2021-09-07 06:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ab5f645e0914c44720538857c916a75b SHA-1: 510ff10e3c1e627744f9b6f06213ed6fb7ecae3c SHA-256: 40520ee53f734faac4f4bbf7b846333892702fde5489a1d6b5218094f6af11e0
156 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, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites. The embedded URLs are likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://nhasachconggiao.com/luutru/files/68439608563.pdf In PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/58epvj5pd5enmcpnhjtb8sf13j/723236410.pdfIn PDF document text
    • https://flomogroup.com/upload/files/wewikokako.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/64349640675.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/98829014576.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6f8275d4a---97267390290.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/82699702748.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100e96b32d49---14570870642.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a435a4c2c5d---vekob.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/28372029185.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/girojuserapibelutorod.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16083b37dd74d7---sumelunezituruwitasamuxej.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b72f428bbe1---rexufajoreja.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/sikipederukomizolifog.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/58105838877.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/piwabujiposesex.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87f7bbdca5---7252221029.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/62959980283.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/89983212917.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbad10b223c---naxalakixumarobaliju.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bae809d9268---12497602106.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/21409473751.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/37620275855.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/vuwasavuzolupuvas.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/d6600df1a089b178f0f8fa91baabc57c/povedawonovov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=i+am+grateful+for+worksheetPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fba62ab702---85852237047.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001741d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1741D 10692 bytes
SHA-256: 93bc34d2a11d3199f3985d75572a95a81b8be65d00c4be9730db69924009a267
font_01_sfnt_off00018cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CC3 19524 bytes
SHA-256: b5afc862a4440795447411324f13cc8f8f2b845667dbc491476214f3dbd3ef35
font_02_sfnt_off0001beb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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