Malicious PDF — malware analysis report

Static analysis result for SHA-256 a970c2706bb81ac9…

MALICIOUS

PDF

98.2 KB Created: 2021-07-03 03:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 820e9c9bf19b38a0a7fd37bfb0cf5d02 SHA-1: 77692e663f2e01ac550706c7fe8e7e9b25d80685 SHA-256: a970c2706bb81ac93bf34153485767ddbf3e946ce1b5b6ba33400b172206ceee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage attack or a phishing campaign designed to distribute malware or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://laborke.ru/uplcv?utm_term=short+summary+of+a+horse+and+two+goats
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0db8d4d0d6---87730495144.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606d618219c65---42659893155.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b4211f2df78---38251437913.pdf
    • https://widepolymers.com/userfiles/file/zilemofimekefoganemukate.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/5f19b03fec46f09059f159369f2b1873/zadirixolov.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/e2e22b35f1ab489651b739fbc166a343/49050258333.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0b2e78d33---54554402119.pdf
    • http://brkvinc.com/userfiles/file/wenuvefoborupix.pdf
    • http://ilksolar.com/Images/Media/files/94661511287.pdf
    • http://www.pattyn360.com/upload/forum/files/40347606745.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/7a24d6e27254b7fa4f3c35c3ae7f0f94/sitaxorudan.pdf
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/98617949725.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d20294776---81424190698.pdf
    • http://sattosushi.com/uploads/files/satob.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092b80268969---68297104642.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/mtesj5b6s035e1913oh1urrgic/zolirajudalanukajezo.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a19bcd9cf---ludelezo.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add9ca4a492---pobiwavexagopugawomosa.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/00264e0812e892834bb145184c9ae340/kuvugo.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b28db15c---mibakaturekezubuninumugix.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c40126a6c1---21239064974.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/b13c00cd824ff1327b5a3fae15a467d1/50058120825.pdf
    • http://app8itebarandgrill.com/admin/images/file/wixazorigapinaludabukoxe.pdf
    • http://vector-luczak.pl/new/fck_user_files/file/gukukisonilafemiw.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_off0001165f.bin
11a20bab17fe174435586cb2f05ce30e5ad85a780a42d67ede988c932d3ffa5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1165F 11040 bytes
font_01_sfnt_off00012fca.bin
e8eb0cc5a958f8f87dd2d50017fb559ba8de25619d5ced5dfaac3f3273fc5517		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCA 18832 bytes
font_02_sfnt_off0001619e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1619E 16792 bytes

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