Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11bb440968349b1…

MALICIOUS

PDF

85.7 KB Created: 2021-07-23 15:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eeadc5a780f608ad4841af1c57d9a8ae SHA-1: e96f87e6e23c31ae94b15ec3d9fecae249f7d0d0 SHA-256: f11bb440968349b1a50bc63d1ae36d6122ec3c0287d1bec769b3938293faf1e9
96 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the heuristic firings suggest the primary purpose is to drive traffic to potentially malicious or SEO-abused websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vujodaxejoxufobe.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608f598d12de2---17681540568.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160832944eed7a---zobusajuvumokonedafewixi.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/b6dbubmlhgr3htjiidof03utkh/xozidefajufujefakabur.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/3aa14f86d2f8d328e3d2045801946015/91227195900.pdf
    • https://dnmpaint.com/sdcc/images/file/19096591365.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/bsebb6c805gs64tn8m49gjgplq/69206653614.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/e792705d974cbc23c49d7f29c6c21794/damamufunazunaxigexilo.pdf
    • http://embeddedhr.com/ckfinder/userfiles/files/xakixutojo.pdf
    • https://anukulagrotech.com/userfiles/file/dewazufilunapabu.pdf
    • http://crosswaysrecruitment.com/userfiles/file/zajaxutirizedezusolo.pdf
    • http://bidmitt.com/img/files/file/82947587631.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3a9684665---fotet.pdf
    • http://digitalpolicycouncil.com/imagenes/file/4739667483.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/cucb0asc292dsek827qff0ml18/83979394594.pdf
    • http://brixtontaxi.com/survey/userfiles/files/sanudufinidenitixobi.pdf
    • http://itemclinicchina.com/ckupload/files/36594182634.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0219a4f07eb0fac29faebc0672693f98/76418395833.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16084c618130db---15362710009.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a4d192fe92077291edf185fe33d95d93/nozedowovurul.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ef2c0801e---288471416.pdf
    • http://ajisushionline.com/uploads/files/45624947700.pdf
    • http://marcobernini.it/userfiles/files/36145384225.pdf
    • http://castudio.eu/userfiles/files/8967595227.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=spanish+preterite+exercises+pdf
    • http://e1pl2.nazwa.pl/busy/fotki/file/65841832432.pdf
    • 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_off0000e7d0.bin
439e60a848a4030653f364cabdab641116e7cd6a70cc783f3946356712fcca49
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 17956 bytes
font_01_sfnt_off0001162f.bin
e83823ab946b4a3d49f83316d917ed43be462fbb1ae9f77d7083c994367b7191
pdf-font-stream PDF embedded font (sfnt) at offset 0x1162F 10728 bytes
font_02_sfnt_off00012ec8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC8 16792 bytes