Malicious PDF — malware analysis report

Static analysis result for SHA-256 210de64b11f6c672…

MALICIOUS

PDF

75.8 KB Created: 2021-09-01 01:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 743eb6d08944de8f3fd45194c1903fa4 SHA-1: 7e2e19c3943933cc769e94c485479ac8e0d98211 SHA-256: 210de64b11f6c672cee188fd56e4bba52bd6fdd97c4a78d836e0266079f98b50
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites. This suggests the document is designed to act as a link farm, potentially for SEO manipulation or to redirect users to malicious content. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/62c9004823ffe1c154bebe128c2b77cb/suxusixeweja.pdf
    • https://kovtec.pl/eurostyl/photos/file/repatipozetapalimaw.pdf
    • https://bahispesinde.com/gnc/veri/_files/basawukuxikatar.pdf
    • http://mathcountsoutreach.org/userfiles/file/96804145629.pdf
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/fafuvub.pdf
    • http://aceonlinementors.com/userfiles/file/74569984210.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/bce8d5b2ab00956e8ef905e160bdb128/53011020921.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26dacc58dc---23538827129.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9e3353feb442021411d106925df6b80d/rexokonivitonumebeziduled.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125e8075b02a---61589529895.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099f82da5d37---nufudosetej.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161047a0216c7d---mozirirujototimadedujubon.pdf
    • http://clarksville.net/wysiwygfiles/file/85804962537.pdf
    • http://www.ctnphrae.com/ckfinder/userfiles/files/pazelaf.pdf
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/kopomaxifelak.pdf
    • http://gamecoast.by/uploads/files/47829224615.pdf
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/99921385058.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/30d34ee7115c62ddaf85831858551c8c/31064516723.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160942c73f08a8---famowefafolariwes.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/knr13oss920mos40f2go4p2nr5/lozezeveza.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/6a78b7a5015d9a8fc582c75e50cfa219/82534141475.pdf
    • http://chipgene.com/image/files/20210707_005436.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=what+to+do+during+class+when+bored
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c45c.bin
415fcce7c5de0a38282c750cff6c7401e09cd64388f913de204a30471f8bb4a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xC45C 10968 bytes
font_01_sfnt_off0000dd9f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9F 16792 bytes
font_02_sfnt_off0000f5b1.bin
cbc896e2beb5e5518623c44037609a4986195e7a6ffe7bc7b1b8a1ec21337f5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B1 16644 bytes