Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe18291f9d591d8a…

MALICIOUS

PDF

91.1 KB Created: 2021-08-07 22:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cf9e5c78e170b1b811fa941eaad9cdb8 SHA-1: 257d94f17b85d1ace71dac525c059b83d13b6e45 SHA-256: fe18291f9d591d8a0eec159f3ed5e87203b634fa8adaf726ca35a690c647d2bc
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the structure suggests it's intended to lure users to external sites, likely for phishing or malware delivery. No scripts were extracted, but the heuristic findings and URL patterns are sufficient to assess its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crewmak.ru/uplcv?utm_term=10+piece+jigsaw+puzzle+template+free PDF link annotation
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f94f6c07062---65039988484.pdfIn PDF document text
    • http://greenbrier101.com/userimages/2744647381.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d92660635c---63530641666.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/42685537327.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/38401968991.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/ribolowapo.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/aa19e3e3811ec3299547ae40b129dbca/baginifoxerigawix.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16071c990a2ed4---xufajarikit.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/mujexopulezoruva.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf045a18c2b---66790750774.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/68e3020ba8a17b0f3c093ceb4d831d42/95040415056.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104021b44726---semowazidumafesixuzaf.pdfIn PDF document text
    • https://ijpdua.com/contents//files/jumozoxigut.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/58829645914.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/89949489022.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/5s8dvtujks44cfc7m83m6722bh/9963318773.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/a4533f3d73da60410944fa24c986fff4/fifibuzavuloxuje.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/92716011708.pdfIn PDF document text
    • https://tmtteks.com/files/pixavofujebosedo.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160fc53aa45f5d---60947591818.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/94084051842.pdfIn PDF document text
    • http://industriefotografie.ch/userfiles/files/99276020812.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/36713893450.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/cd6f03efa0886976abb7b7c0576271fb/rupuzi.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/dda114663a83d9df639290d8d2704605/92394413339.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_off0000fded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDED 17496 bytes
SHA-256: 80ef49c34195b819d178470384400416495eb60593db8a9ebad4f251ef991938
font_01_sfnt_off00012ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143B8 11052 bytes
SHA-256: 9378ce31320d2dbe2ad097e41bec1dd44eeb7972227e9e4666b17d32f181dd47

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