Malicious PDF — malware analysis report

Static analysis result for SHA-256 acdea78338f37866…

MALICIOUS

PDF

87.0 KB Created: 2021-07-01 23:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9bbf2d176e9465c21f543421eca9d459 SHA-1: 6acb66b660e993021c32db59e15c43ed9629cd69 SHA-256: acdea78338f378668cbc49cc5e942a23dec42ac5ebca8310e0b5085fdbe60837
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. The primary purpose appears to be redirecting users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://nomylo.ru/uplcv?utm_term=heart+related+shortness+of+breath PDF link annotation
    • https://facades-et-traditions.com/actualites/file/82489948665.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/namepebe.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/fusiwufilipifiwi.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/wizogekupitibejod.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c1216121d---61666105666.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608063e5e54d3---kimadeporuza.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/boll51nbbg1pgukcpdbt9o5946/81936722273.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/zosaxinopinitu.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8dfc95717---19125788247.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/92521893601.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/jijuzolug.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/3645afbb8816685cc10bfa800ddb2987/92052810432.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf8dbd7285---jogazidabanibinekima.pdfIn PDF document text
    • http://hongdacable.com/d/files/26676626738.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/8ca21801bfe67937b9a43b1d73c893ae/78487101095.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/21996116887.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/rorel.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210609_B499A41F97B4DCF2.pdfIn PDF document text
    • http://eva.am/files/4a3e34a73e89480d.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/vowofobedapikitire.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/676af3cn8800lmdq1t6os26pu0/99080202043.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/35765943175.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_off0000f200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF200 17152 bytes
SHA-256: e898e13e844527e3b858d1a731d7d14786451da3e3e41da298402e5a378afdb8
font_01_sfnt_off00011efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13712 10488 bytes
SHA-256: d9355ad66942f8a5e82c6764e68c242d4c532360f091e39851019e0635667a16

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