Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd1d9fbc5673b6f…

MALICIOUS

PDF

96.9 KB Created: 2021-06-28 00:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4d753469d36ea8c12205b8552bcf927d SHA-1: ca62dd994098b61e2d3eaec76ef4efec00fc521d SHA-256: fbd1d9fbc5673b6f1aff4512aff4797a5e7e94f30702a9a8c5f2a4877f5144ff
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious or phishing content. The presence of multiple PDF files hosted on these sites reinforces the attack pattern of distributing further malicious payloads or lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/bd1901b0cf1a58f9b5b2eb827c35c200/mirelad.pdf In PDF document text
    • https://aduanaldelvalle.com/userfiles/file/simegogiwegiro.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/d7c5a6f2cede5a80cc4afe4303c7b4ae/judozomanekikedel.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/35eih5nlbuu8uhkpe1ar6qkda0/fiwexanaxazimon.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/0ef21ca583e7ef8f7d6bf919e9878928/zijuruv.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/rosizezotuso.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160843da9d9716---46777848810.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/witadoxot.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/xoluwodepux.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160704c4cdfb24---wesotisigolefenabas.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16099a3f784981---39849802476.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/pesimemejovurogoliper.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/8b6ed301dd334104380143c6bd361834/wofolezite.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/pamizasi.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/bominozedosozov.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/66017957813.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/ff7b0d3b40438f010621ba88acadf205/motexajizavotarog.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/58654088523.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160794075ca99f---38251660282.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dbb00fc14---10621053446.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29512e66e7---4259568458.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/91612857739.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/eb6714a3ccd380d541e25e440c2f506e/wolifaletazovovusepalozom.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/23fdd11651feceef34b9a05c2d8debc1/gezej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=harelip+cleft+palatePDF 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_off0001191f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191F 18180 bytes
SHA-256: 88054326651ff9523151e717567bc971be9ba08fc8578f5c1bc0c1acebf73f31
font_01_sfnt_off00014806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14806 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001601d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1601D 10072 bytes
SHA-256: 71634ecfbd8c879e4b48d2c61f61c61ea68ffc9d069018043625cc5e0eec86bf

Open this report in the interactive analyzer, or submit your own file for analysis.