Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93c350820e51433…

MALICIOUS

PDF

70.9 KB Created: 2021-09-10 00:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3e9290dadd4f145acdcd682a186d7eef SHA-1: 1d5e388bc7e421e32bfbdc9b289517c0b31d4018 SHA-256: e93c350820e51433adde832c53bde05db4075182b8a5e4ac6b3f9baa4b0433c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=android+task+scheduler PDF link annotation
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613229a5ad5f4---tovazudimukoferefalawisi.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/juriwu.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/39599363005.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/wulepotobu.pdfIn PDF document text
    • http://xsteelstock.com/d/files/68335375991.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613382fde2255---jovowuvikeligedakasev.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/bemigepirivav.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/91818312300.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/xulurorinef.pdfIn PDF document text
    • http://malifer.hu/upload/file/pitubikokixupedu.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/legelifejanudux.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/janaled.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/87371753786.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/e370ead269c05d4c692dcef0519baa32/xexojorerovapixorag.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/11891298642.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/89582782502.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/10865950741.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/wefazu.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/sekepapibazomotemijijo.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/feruvakafejapalizex.pdfIn PDF document text
    • http://spharma.ua/files/file/99269380346.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161397a69f39b4---62347841819.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/vogujot.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/xagupuwalimobuvapaboxelo.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_off0000b859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB859 10640 bytes
SHA-256: 801cedb703345805831a750939a0c1b49d532146afd4f68076886e78d513b80c
font_01_sfnt_off0000d0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BD 14772 bytes
SHA-256: 2f94514b2571321a71f6b597bb9baa7783eae2dd0cf4ce360c3213fbf62b03ca

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