Malicious PDF — malware analysis report

Static analysis result for SHA-256 071c774b12f6f7e0…

MALICIOUS

PDF

94.2 KB Created: 2021-07-07 02:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40f221b5086c79af6114f408b50a9dcf SHA-1: edbd33fa2ab2cd9cd20d293e91fb2c98a18cd4ad SHA-256: 071c774b12f6f7e0d9a5a527021c03462c1b2532e525e64d666e853142569a6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://archism.ru/uplcv?utm_term=all+about+ruth+bader+ginsburg
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/fdd69a6c8b42d7d1600dd13ed2757d85/wafenusukuzijabimitoduxi.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a71731415---xutaro.pdf
    • http://stalmost.pl/userfiles/file/39984568936.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1ef1f1527---gipirew.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/071cb9dcc4c9f98bc5771e197ab97ce9/nijarujesuwogided.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d01bf28bb3---5720187541.pdf
    • http://mosjob.ru/images/file/sanidizodusudose.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf13a627e3---letibinutajodavupebaram.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/549da6abfba04ef43f0fb0437f2d067c/penokam.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608308c9ca1c6---3126795870.pdf
    • http://savvyais.com/userfiles/file/54254311588.pdf
    • http://physiotherapy-warwickshire.com/user_file/file/vegijiw.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/ac37e6b49ebe0b0fa9c797b7669b9b94/24472666347.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607deeea8f954---tanaxurivi.pdf
    • https://harkakotony.hu/UserFiles/file/moxamevuz.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080312391493---fepemafuxunelupipedove.pdf
    • http://fotossc.pl/_files/file/sokofakage.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/3c53092931b843c0fa3738db402d36c8/pirupumuratikututufujiwik.pdf
    • http://matstravel.ru/userfiles/file/zizipeseb.pdf
    • https://paperland.bg/uploads/file/59476518877.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d1ea1b4d7---53028618904.pdf
    • https://oddluzanie.net/userfiles/file/dilipitopimowofamozes.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c010e3b69f5---21062721294.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/cabc20404755ec10abff1ca338d3658f/ludotezir.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_off00010bf8.bin
c57320437eaa9b7d2d0cbc0a7084c0d212ef9ac5ad8d6590c12658d897915536
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF8 17812 bytes
font_01_sfnt_off00013ad3.bin
3cc0af9c6b240a61ac9767cca59b6253a1127a88d8364da544871b35bbf410f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD3 10748 bytes
font_02_sfnt_off00015346.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15346 16792 bytes