Malicious PDF — malware analysis report

Static analysis result for SHA-256 6130060e2981e48c…

MALICIOUS

PDF

90.9 KB Created: 2021-09-06 21:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b9935a93b282a672431ed817699506e3 SHA-1: 42438c83606c8fd6c61b63671590d2c75509516d SHA-256: 6130060e2981e48c7c7d541874e83581c3b18edbae874aac8766cc4f4240da6b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

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 https://abyway.lv/images/ck_images/files/67532359279.pdf In PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2d23d63d8---54187545316.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/9clpforn41cgv4d7kl6vt6hfjf/18285233249.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e748e790d5---46952385423.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/df22767nac4v8urol70dj3886e/39965217274.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/9970545144.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c579d5bc3e0---69674360302.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/12467427070.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/muwaxeka.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/tefugupegonusixozapo.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16097ce07b3da2---72348897282.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/26497393836.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/198b042cfe2c9383fdd2c982e884b69f/didomebulokomemufiru.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/7973349a2834baaf57a4f806b604d8c1/76814253901.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/19613822096.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0721a8d9c2---turez.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/79956202449.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607001429da77---fetugovogamixo.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/82150421006.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/vegidosofupuxabag.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/82ff4a1f493e78bbe0d41016b0dc0cdf/zejomakuvel.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/5c4e7d27ff3cd0bc4887250dff80f3ab/vunizusewelusinajufipi.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/51780935539.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/uftuuccd1c68vr2n5tlv4vqb60/vorelasokes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=limpieza+hepatica+y+vesicula+pdfPDF 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_off0000fb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 19388 bytes
SHA-256: a05a5a35cf1f8c7fbb26ec8cb319a6afa10137110b0190b30c5d7bd6bacd9e8c
font_01_sfnt_off00012d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2E 10856 bytes
SHA-256: 32d97d62799749194946d180061ccba95ad01bac81d28fb60d295bf29a24c0b5
font_02_sfnt_off00014657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1