Malicious PDF — malware analysis report

Static analysis result for SHA-256 b248c79b94930be0…

MALICIOUS

PDF

78.0 KB Created: 2021-08-05 23:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9569341f33e502a085d74648a327c1b0 SHA-1: 68e13b6fe847fae2aa38a1f4d464e262bb9f42b3 SHA-256: b248c79b94930be0167be87fcb7dc1e80c8501c9ef503459e04ecde618c66f5e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for phishing or malware. The heuristic firings specifically highlight its nature as a link farm on disposable hosting and its use of compromised CMS upload storage.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://huntic.ru/uplcv?utm_term=fireboy+and+watergirl+light+temple+1 PDF link annotation
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3754ce071---36291596111.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/40910518703.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/a049840376e571f07a06757c531fd333/juliju.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/zozofajulunonemitoxemoka.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f08bd987f9---kisadizaf.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/gefavuto.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/45058885934.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609857cbe2b11---53066880264.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16099eb3547ac9---pofazeniwokoluvone.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c5d785777---84357864605.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/34354200096.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79c2418b6---63847350853.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b160f78fa00---godedokusef.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/susizovaluzukususap.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/7ce3f6adb51989bbdffb34809bd3b22d/bobemezukelimurigonebik.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/d2a3d8fb535cc3f719d03b28d921d986/7312689655.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160910a3ab353b---wulobegizamimemikazo.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/vumifibegekut.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/02f88bcf2d02d28fde18e069d2243535/38624251790.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/60225531486.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2dd69ba6d87b7be2c5e28930e24e8a70/revodapiwef.pdfIn PDF document text
    • https://noddy.nu/images/file/vukawaxojoto.pdfIn PDF document text
    • 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_off0000ce60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE677 11040 bytes
SHA-256: 0901d11c731a46ca67f49fa486ac5ab5ab3c9c76cdf6ac7f3f42e23fc093e468
font_02_sfnt_off0000ff92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF92 16404 bytes
SHA-256: d9d0c0217d55ff8815cb17907de094ff5b207f4ba786accf35df3096d093545a

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