Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd330227870b25d…

MALICIOUS

PDF

96.5 KB Created: 2021-09-06 21:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65ef7315da747fb42b2d71e53fe4495f SHA-1: 1eebbb4ed9e2d2dce06125eb022099d48b4b067f SHA-256: ecd330227870b25d900cc6414de6f14e102ba3552643eceae1a931ee3ae034b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs, many of which point to compromised WordPress installations or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://medvor.ru/uplcv?utm_term=frans+de+waal+pdf
    • http://cafehinglung.com/uploads/files/98158282182.pdf
    • http://wagnerpc.com/userfiles/files/xizosopevivutujatarirut.pdf
    • http://accessprecision.com/userfiles/file/45691020972.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44567c3a4b---luketigo.pdf
    • http://drprdesaihospital.com/uploads/jifumujizupibanito.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/a5e0374ebd14130e52d5ce02cfd8ebd3/42194953937.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed730cc092---kuxibudofatetolaxekik.pdf
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/fawizuwatufa.pdf
    • http://charivne.info/images/file/bafominikeforunilidu.pdf
    • http://potlista.com/file/files/modozemasapifavamav.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097691f739bb---falorurugenewasovowori.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161165f56c9976---tiwetefitixetugewosagidiv.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/fn68qiu4bbc79dkhfonih7ioq5/jobaxa.pdf
    • http://tonyprins.nl/images/uploads/file/zopedumikugibem.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611ac3741283b---vivekujubezanamunosijemeb.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d501f45b944---nolukofijofoganepizuwu.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/m3o34j5ri8bhr3ibdf1g2lt6l5/96729297893.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a38f2553f53---renugulir.pdf
    • https://incense888.com/uploads/files/202109051744376844.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3e7d48e6---tesukonekuxaw.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/a22942847f5ad06ab0572e0793ddc7d4/vefixodisotoninalorev.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/vm9r6vrp2gjk6ptej9se8j5imu/wajatowalagaboradujovure.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/pp7kr3sa4vgb2jskle9mn66uai/31070177346.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/7e7039a55e4c1a25b692c388bfb3f86c/91715654323.pdf
    • 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_off0001145d.bin
98e890a618b5450abda6804d6189a852770428b123067b4bcc0c85fea32fd155		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1145D 19020 bytes
font_01_sfnt_off0001455b.bin
acff192f6217648444b219a51ed4fb7598faf15390c18e3d413d4233ad7122a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1455B 10244 bytes
font_02_sfnt_off00015c7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C7F 16792 bytes

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