Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c60a4396157b0b…

MALICIOUS

PDF

103.6 KB Created: 2021-07-02 08:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1680fc61ef098181b258b91766ecf4dd SHA-1: e942bbc007920ecedfbe74d6713983cee7218b76 SHA-256: b9c60a4396157b0bfa51b4f21e81408d546ebfb12c8ae00a11b64eadfb12aa66
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to other PDF files hosted on various domains, some of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be redirecting users to potentially harmful content or engaging in SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/54575805057.pdf In PDF document text
    • http://artospace.com/pics/file/fawebamebebape.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/2f8c6143eb86e5966d4d20247353bbac/45169989424.pdfIn PDF document text
    • http://dogable.de/userfiles/file/67856549521.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/bad0855ff4ef16caa0ce5fd05e92e13e/30938750427.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/rinubezumapaxiwogu.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/27203262655.pdfIn PDF document text
    • https://mauspro.net/upload/files/wafivepitaregizaxoxapo.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16078b75c6fd32---nudijurutekavuvowakev.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/nutoselivasuvajoziju.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9cdc4fc6e---44988764388.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/36191b9f23f3bb8b7c83aeb442a05dc1/varowar.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160712deba53ef---73833577799.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/69449212609.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16097755d21a3d---zunaxukenokofuwato.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03f6a09d1d---vurozagifiditan.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/15ea01667a09c3b64ff27972b79686f2/xipagumezakaro.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/44846714817.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084b71c3e668---konasuwonuxezefub.pdfIn PDF document text
    • http://ashioke.com/images/library/File/nedapusijuxatabon.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/xujowafa.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/ee4aa8a0c08dbe0705436bebda3ab612/41581497762.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/lemem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=sonny+with+a+chance+cast+then+and+nowPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000133c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C2 17156 bytes
SHA-256: 7b6875c059706f61c027e4e496ffaa1e5949a7d568555b23b221e29ddbf649fe
font_01_sfnt_off000160e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160E1 10596 bytes
SHA-256: 04bceb53c968e670b5c7663d5a79538b8e8e39843e44d088a38e471ee9ea6f97
font_02_sfnt_off0001791f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1791F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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