Malicious PDF — malware analysis report

Static analysis result for SHA-256 21fffe8be930d987…

MALICIOUS

PDF

88.7 KB Created: 2021-09-16 21:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0ee64f0e14baecb3c91493c30b06fa0b SHA-1: 417eb0abb23b2ad126ddaeb2b4a2541f890202a2 SHA-256: 21fffe8be930d9876ee74118630b25efbf75a94d977048fb617716e4653b35b4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of these links suggests the document is designed to lure users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/49008116653.pdf In PDF document text
    • http://denki-shonan.com/uploadsfile/90288282573.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/mabewenuzipefizuruvobiwa.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130272565031---xebotawusosewakor.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/6779901577.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/tkh1td0pc88dbcvv4r7vavjvcf/vexirofomefuwalinivif.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/nifaru.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/35126692181.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/92520161781.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/44022212387.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/93706459635.pdfIn PDF document text
    • https://bem-sa.com/img/file/sisizewonodazesafid.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/momewofinesofimetewunes.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/ruxije.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/fujaxabugapulopex.pdfIn PDF document text
    • http://hkalc.com/userfiles/duropi.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/xedusoxokuxeg.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/161419af4b2ffe---55058873822.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/zokonoropofekumidi.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/95312034287.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131211531031---lujeki.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/dawudosabubobiluvalitabip.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210906_B6066085FEE0D03C.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/pofukilidusuzagabiwe.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/kasixobapif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=among+us+free+app+storePDF 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_off0000f782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F94 17364 bytes
SHA-256: 53f6a47e09ad3cbb1b24734dd5c94e75c5226c35d91f6fd80a589cd17e775b91
font_02_sfnt_off00013c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C77 10644 bytes
SHA-256: c6238df15cbcdbbc9446c38e748370f80300453ef930e1ec56c461ca17b8b7e3

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