Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad9363f7af4a63d7…

MALICIOUS

PDF

83.2 KB Created: 2021-09-05 20:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 61879b378f006b6b339d8b9b061358fc SHA-1: f7b3c8efce418ef1d3c225366241a33f8dfc74e7 SHA-256: ad9363f7af4a63d79d0bf2b120708c2a46f5a55307f99ac10ccca2114320e672
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The presence of embedded URLs and the overall structure suggest an attempt to lure users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://garglob.ru/uplcv?utm_term=split+pdf+page+in+half+vertically PDF link annotation
    • http://caudafotografia.com/userfiles/files/pigifewavavugasubog.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/12713293145.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/paxupewogilojejow.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/e03183637869b2dbdb261df650261901/bewidakinobafizuf.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3d629cfb8---21720652508.pdfIn PDF document text
    • http://cooleywestbrook.com/clients/865832/File/63810449200.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/c6f752fc4a09feafa3b7869664998365/gixikiligidazotirosa.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a62bca0e04c---wemaduziwizejomomuz.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8ba894edb---makajawu.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33dc7abcba---kiwelilaxunakisef.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/difijabow.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/94523441596.pdfIn PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/14184896425.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/36986282291.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/14616974017.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607757e61104b---51540967664.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/3666583120.pdfIn PDF document text
    • http://ps173queens.com/clients/10779/File/sunojatifuxojo.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8a09efe2ac3426915befaf2134d620bd/40375852330.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/9763649822.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1b46d92f2---ganalitopafiruw.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/kebasapejumemiwepisowukib.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/kimusawugasedofixojezu.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079fdc514ff6---46488090942.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/tixifixulidenisunapuvise.pdfIn PDF document text
    • http://vhshf.de/File/90680166274.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/boesnn49u1u8cf2p0tj7aj6q2v/gixigosobatizigunubap.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_off0000de92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE92 10868 bytes
SHA-256: 8aa2de143e3c2d5337b72c2a84551f3973e55e75b58b482328de6efefcc99f5d
font_01_sfnt_off0000f777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF777 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F89 18180 bytes
SHA-256: dcd524555b97541e8abaf5cb9b2b5dd65f8ba7c4852f40b90e0785d376f85950

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