Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f62ea6761647cd…

MALICIOUS

PDF

99.0 KB Created: 2021-07-18 19:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0036564b4ec9fa86a6b34de88a9cba4b SHA-1: 2e4e575188abd184508a37b4eaf3a05264ac6926 SHA-256: 10f62ea6761647cdf92191450a3ffa61ece006b98c8d58191d0e1f87a75a6c5b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

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://blessingsngo.in/userfiles/files/webanojonib.pdf In PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/86325058015.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/97963525640.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/9c8f4b9c5a18b4dd1e39059cad9a74d1/19629805434.pdfIn PDF document text
    • http://easthighclassof1962.com/clients/2/24/240b89ecbeded73b1ae3fdc7544f4fd7/File/40400160185.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160baa46eaaa5c---dibaranopadomozi.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/42597802156.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddc9f5a5099---54603126704.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c42b2d88df0---xizutujixo.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/xikusomij.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/jogus.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba7b5897e7---lusezudolebotewuvex.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/97779142447.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071438fba8d1---60038775681.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/57d6a9099136407fe342fa3fdfe5cad3/jasudowutalifomawegumikid.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/sudufamurojewuwizesa.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/0403413f5bac9937d3ee6b5ee9f53cfe/sanesofanesuxuloj.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5cb51c170---dovusotavi.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/8949041343.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079f7a17a883---puzogawu.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/6nduq5f3nlokqpgc2obat51pb3/saxubamikupomudanirisuduw.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/41663096984.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/50256423427.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be2b13640a3---nigonejijenetijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=meaning+of+hotshotPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000148fa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x148FA 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000ec00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC00 22428 bytes
SHA-256: ee5627e02f2c7c511f00c3e1db819a9968f327f479b4a1b93a933b3e7b8ad55c
font_01_sfnt_off00012373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12373 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B80 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_04_sfnt_off0001669c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1669C 10340 bytes
SHA-256: 6d89e1946049229493f6d07f1868b412d363a311db1b91d959a08c61c8856220

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