Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c76ba56d1ccdf5…

MALICIOUS

PDF

86.0 KB Created: 2021-07-08 03:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8109782d3c8b6c238baa7e47924ade3e SHA-1: b7cd3741ef8419746fec1aabaf9a940820b466d1 SHA-256: 99c76ba56d1ccdf51c75a00b0d3c8b7616f47345cf5cfc9038fe7309ca4cde42
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. This pattern is commonly used to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://alatheir.com/atheirwsfiles/file/83886170914.pdf In PDF document text
    • https://hagepoorter.be/files/files/86603660847.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/1832fdb161b4be61a430033ba3bd664b/21115635767.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/mifabejuzesiputopivubavom.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/6c03b98cf12b5f18492dc6b6fba98872/tewefadobuvojowopofun.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/fuzukozopololavo.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acf29622026---meritevekuvakezuxoda.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/69117099469.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160991712af073---luxin.pdfIn PDF document text
    • http://txextremecarts.com/userfiles/file/nuvofor.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e04afd118d1---69715136820.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e42da653a1---24880275282.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/f34e507d590939fbbbf93d8d6af3adcb/woxijaxikewotuzagafur.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/f4d3cc29f396fd17482b44b0eb3c33f7/povowawelonepu.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b04475e646---fefazozotibuvobez.pdfIn PDF document text
    • https://windsbs.biz/files/file/kaparonisabe.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/taveruluzedugezudupos.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/00aa381921469eb0291797566fc8c9b1/28153690384.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/fc5afc773eeb1e643a8b971c3be54d54/87925372456.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/kisetepuzux.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/46970291426.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d18b3e9df6---84043781616.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/26672551613.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/kodilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=palpitations+after+coffeePDF 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_off0000ee5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5F 17036 bytes
SHA-256: 428c480c2c36c4979a451113dd2053199c4c147e30cc36802a6aef936885bc34
font_01_sfnt_off00011afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFD 10472 bytes
SHA-256: 33be2fca88536c2553cb7549e5210a5d2c74639bb0cad5154e215434b597b7a6
font_02_sfnt_off000132f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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