Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2accbd3664788c4…

MALICIOUS

PDF

109.5 KB Created: 2021-06-30 07:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f80571b690ae13d8f2f550070224dcb2 SHA-1: 831ce436c00a38ca20a6a52e6804eca9e7c6a43f SHA-256: f2accbd3664788c41e87050cde61cda58dae6e220b123aaaba96d6cf1ade6b02
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or SEO poisoning campaign. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9330

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://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/aeun04f34ivdm5bgl3lvmtmt6a/senekegujigonimenaxokejof.pdf In PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/b307bad30d07c7d153f8c6a5279ee7a4/29486275670.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160801af245987---66947346597.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210530221043196.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077362c340fb---femere.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/lemisadujeli.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//11154274008.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a085050d3a---25739623475.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/wamijilinewepomoruv.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608141114841e---60700792632.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1840c5327a---63510448284.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/7d6c2b1a17ab1a1fce8bcd510da920dd/89562418071.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/41881172506.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/ac4caf09e6fbeb4bf986a847ca7b98ca/63640626833.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/joruzunaselugutaduxo.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/351410759.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/57497448140.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/460fe6e900c2ae8fbf0b756c168c167a/8838133982.pdfIn PDF document text
    • http://dhf-china.com/d/files/jezoboxamewisivobe.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/74217411633.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608042e2dc7c5---zakakawamab.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d41f4641e1---leboralofum.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/7233250069.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/tavoge.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/2eirv3tve7e498m76sdp8947hg/65832293938.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ae7d8d8e0---bodozopegukafipenusup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=hydro+uretero+nephrosis+meaning+in+tamilPDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00018783.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18783 19072 bytes
SHA-256: 98bbe80a6c6508ac784b810f1dae6a7ff937283fb9bed45ad552ca843af3e5d2
font_00_sfnt_off0001119f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119F 22280 bytes
SHA-256: 6d0ff4fe7734b26485a506ca81ffa2ad1296eee123e50b9a7a1077ed70008cd4
font_01_sfnt_off000148b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B1 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_02_sfnt_off00015630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15630 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E47 11044 bytes
SHA-256: d56d4b856d671facbfd7bbd2e9575712ab6cad5df0d9c3e405d77322f95d7eee

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