Malicious PDF — malware analysis report

Static analysis result for SHA-256 07d18b4734f9e166…

MALICIOUS

PDF

84.0 KB Created: 2021-07-31 08:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c2c34782be2f7b8a78f7cf6a642f93ee SHA-1: 34e8c507314eebbd08dac3e6b5975a71d4742b64 SHA-256: 07d18b4734f9e166e4848c43975d66ea7ef7db41a1fb6e4e276ad32294b1b5d0
156 Risk Score

Malware Insights

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

The PDF contains a link farm with multiple URLs hosted on potentially compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous links, many pointing to PDF files on various domains, supports the classification as a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mhinflatable.com/upload/file/85673937372.pdf
    • https://assistenza-termica.it/file/zeterawemu.pdf
    • https://aquafilling.com/userfiles/file/39602344301.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/0eacd9f44f420c3e36bbb4f63a231620/rifesiduvomujubasolakun.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c65de8bc0ce---78468974175.pdf
    • https://auto826.com/uploads/files/betefuzebopumikexa.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/75159575877.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/uk3q5ui9bmd44m866silau6tje/79091774893.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb77f76726f---66538738929.pdf
    • http://mynigaoe.com/upload/file/20210510033525.pdf
    • http://rolmech-strzelno.pl/Upload/file/99335769619.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/3c33d77fd7907412216979965490c5b8/50660098879.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/rpkftau53jrnrg0tj9knh4k6vb/88317282793.pdf
    • https://termofriz.rs//files/38398140243.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b04ab37d45---96382111515.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f480eb3badc---20422863176.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=break-even+analysis+for+multiple+products+excel+template
    • 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_off0000e11b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE11B 16792 bytes
font_01_sfnt_off0000f92d.bin
e788f335cb6e96bed5c0320a094198c265b3dc9f8e75a1324ce0a228210da40f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF92D 17384 bytes
font_02_sfnt_off00012703.bin
d4f09cb89fd8446f0e0a7a0298fde28b6b8c17969a27d78ae4fb139ed8b617ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12703 11340 bytes

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