Malicious PDF — malware analysis report

Static analysis result for SHA-256 41dcb5daf904c6f1…

MALICIOUS

PDF

84.5 KB Created: 2021-07-17 20:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89e0162b76f6193e0820a7be69023b52 SHA-1: 0162c7c137fd7413e14848638f07fe446f2ef800 SHA-256: 41dcb5daf904c6f10e76565e8a978660a9acf6830937f01dd1e5253804f4fb34
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories and other potentially malicious sites, suggesting it is used to distribute further malware. The presence of a visual download button further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f62a98490---52177206342.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b0c569ec309---4921323891.pdf
    • http://www.tokyomagic.jp/images/library/File/kamifugupusetinusegule.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/924270b75134b16222f6b4ee8338eb5d/16583647106.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/4dc9a17dd583ba863824f97d1baf9281/lemenukenot.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075485f2533d---19804905335.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2aecbcded1e830b2bbabed749a43c3bb/vupijorino.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/07d6740dd3111440e54f19be4164a639/baxadowevetiremu.pdf
    • http://baovephuongtroi.com/vietkiendo/upload/file/78134291453.pdf
    • https://locoffice.ru/userfiles/file/vasudemozu.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074d046a14b1---86407108215.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac61137d63---xepipuxaburado.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b136b6099b6---94755520606.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/adrteg8una1oro6cfdi2mii8m1/tikekojuvarurubupesonez.pdf
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/titarasonuzimowotipegib.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1a9d5e1bb---mikusofilin.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/40d33bdd6b6e06ea03d48ca74628147d/remipitemuxujibuva.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d004d036d---xoruxeparet.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/87887941376.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16085751a695e0---86382291805.pdf
    • http://turhantur.com/turhantur/files/fukiwizisaxu.pdf
    • https://its-bulgaria.bg/files/file/sidali.pdf
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/78908854330.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=conjunction+to+show+cause+and+effect
    • 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_off0000e5b1.bin
dd947df733a0dc41b339d76ffb35be101e902861859940a6c26f3712cc37abf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B1 17580 bytes
font_01_sfnt_off000113c0.bin
59b25ad1826c08d2bb448c9953157f5382f2b5663ec48bd77dbbc5d28b4be6ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113C0 10772 bytes
font_02_sfnt_off00012c91.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C91 16792 bytes

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