Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1355d9409d7839c…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 17:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: b1f03b7ba8d4e55170136d87865a15f5 SHA-1: fd79ca2c3a51b6c1647ca0a1b3a7326b8279e854 SHA-256: a1355d9409d7839ca85b3e71de96fb185e57b6555a817e80f3496a7d1985eab6
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness, and the presence of multiple PDF-specific heuristics related to URI and link farms supports this. No scripts were extracted, but the overall structure points to a malicious document designed to lead users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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://ketchas.ru/uplcv?utm_term=shi%27i+islam+an+introduction+pdf PDF link annotation
    • https://cmottaviproductive.it/uploads/file/10087177803.pdfIn PDF document text
    • https://soltendance.com/stockages/files/84535497890.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d225b225af2---23722771692.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c23a12b51---72599196105.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/zobugivajivedorajivunobe.pdfIn PDF document text
    • http://amdind.com/userfiles/file/gozazesosewomufudomazeban.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/20862272736.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160fe0590bdff1---11594659451.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b890021c0---61908115671.pdfIn PDF document text
    • http://theprintfactoryvietnam.com/uploads/files/66394715635.pdfIn PDF document text
    • https://samowar.me/userfiles/files/12500857270.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/2uk89pnhbeir94v60i1vglav22/26641631779.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160ac12427d7f4---jejunozupovawixikij.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210625_173316.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/smfp3tg2ph256i29qtjq2t8vj4/19560700087.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/11929651006.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210831071433.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/29ee91de1a96dea6a99cf2447cfd9f81/41867186937.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085236f55dd3---wizajijo.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7d4d588db0---lelinitonipuviv.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/refifopatelewogoxosibudid.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/6ec2d401dee1528ddb0f625867d3be03/33016288431.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b46a64b439---bujip.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_off0000dcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC4 10960 bytes
SHA-256: 2527a9bdf03cdae8bb9e34c19bddcdb0d3c78dce43bedf1213edaf12520c40b3
font_01_sfnt_off0000f601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF601 18048 bytes
SHA-256: 113625911169ac68c52c17caeddb02803ff177b7c172345fc6dcc8309c88f17f
font_02_sfnt_off000125d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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