Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b4d9756e5b2aff…

MALICIOUS

PDF

74.1 KB Created: 2021-09-01 18:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 364edbf2c25e1d58ce8b5288b2f0c9a9 SHA-1: 88c7c590ceb5ae63ba6755fb29c8337698875c21 SHA-256: c0b4d9756e5b2affbe20462136b45e1372c4a62e7c728482fc16dfcc2a03b180
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support the link farm and potential tracking/phishing nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8d12ef2b9---74142000896.pdf In PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a9e2037f5b---pevimawunadozozo.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/46909678258.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160e1fd996e37e---vokefonazoxiketunutapi.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/38489550499.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/manoxiz.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/rizenetozexebir.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/lavifimon.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/90313031949.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/mapejofevi.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16090f68024c78---75146293840.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aecb79530d4---xedegenuparepamamadijeve.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/0mi50hookd5vj4k3sp4gjs9r91/dumilolufijanesisabe.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/rani7fmma52q6gu2dc719gooie/kifivosirupob.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/24535607167.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d986f7123e---18273768279.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/79357525289.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/xevarefilojuvosog.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/ledimamadufavaj.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/wonesufogil.pdfIn PDF document text
    • http://barnesfamilyre-union.com/clients/52050/File/lopusivogudis.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210704025733.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160afa58831ec8---25100781898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=can+dogs+eat+smoked+meatPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/20d5d2de6a27c633d76cda30b7dc0678/58902516514.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_off0000bfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA9 10476 bytes
SHA-256: dfa54e63e722ecd250547e8f8aaeeb008555b9c975b0eaf0e71ed4f9c99552ac
font_01_sfnt_off0000d74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5E 16752 bytes
SHA-256: 898344ba4edab0bc30b2242788c6ed1542aadbfe6d1924723741336a80e08593