Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed34e4c148962fa…

MALICIOUS

PDF

85.7 KB Created: 2021-07-08 04:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7276f334be9a1157184c777036672596 SHA-1: bf6137425411e7cd7d9ee58e3f771c17825dcb48 SHA-256: 9ed34e4c148962facfaf24dbe4ab7a17b3521106b520cc17bba0a5712e9c9a2a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting sites, likely intended to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not meant for direct user consumption but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://pelletier-tp.fr/ckfinder/userfiles/files/66513645378.pdf
    • https://infrastone.com/userfiles/files/11149607723.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607721a2d214b---90736732982.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf656ec61d---zipixogabivemosuduramotos.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87e76041d9---tawopaneretomewewimime.pdf
    • http://www.blueoak.fr/image/file/65649358358.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e3f564154---51627358993.pdf
    • https://inverpalmas.site/aym_image/files/miwevet.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/5hav1micr5pvl832jptgum3ra2/kewigudotejirimisapumez.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-4-30/20210430164518269618.pdf
    • https://xlspandoek.nl/userfiles/file/wibovezuxi.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160809a75e75e5---lelegubejepevofokutibusuv.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/64a8d36cd902bd887eac5869688b4c98/juvovakikufexadis.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d1963453e---53016394942.pdf
    • http://shinies.ru/img/lib/file/velebeses.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d23817b919dec10a8fe6ff793975ca69/56725082620.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbcb89109b---vizimarigakagozezobiwo.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160796ec02a7f4---165125638.pdf
    • http://casier-a-bouteilles.fr/file/motes.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be960dda735---73748376012.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/5ha3bmb4i89vcj0oa6sg9k3kfk/12603450587.pdf
    • https://arte-salon.ru/upload_picture/48956405333.pdf
    • http://qianxish.com/ckfind_image/files/59929561283.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898f9b70c65---nimawinelexajonuvebabes.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075625fe4d19---89555396694.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=outburst+game+answers
    • 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_off0000eb01.bin
a5745b8f83afb676cbab90c9d35110ecb58943dccf0a81948ceb4907fcb077ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB01 17776 bytes
font_01_sfnt_off00011915.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11915 16792 bytes
font_02_sfnt_off0001312c.bin
20923161ea3231aa70287cdb78d7da9e8ca35e24b7d0f4f3e4862b72aabb4dcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1312C 10544 bytes

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