Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ef64e3c566e9e7…

MALICIOUS

PDF

83.5 KB Created: 2021-09-03 13:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 63ee79d65487d3dffcebbf6dbe51a65a SHA-1: 014c156a483ac1d35d0c64d4e95f731a59556ca0 SHA-256: 34ef64e3c566e9e7f35ecce584629416f3dd107d15b393650ca070e5b7fcf563
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. The presence of multiple external URIs and link farm heuristics suggests an attempt to lead users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://coretry.ru/uplcv?utm_term=shaper+machine+notes+pdf PDF link annotation
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/20652407129.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/46493204103.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/37429619929.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/86594577763.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/viseropulesulumutisorax.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/zetiwogifutu.pdfIn PDF document text
    • https://norservis.info/files/files/85876769107.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/54011231281.pdfIn PDF document text
    • http://chapelguild.com/images/usr/9745524639.pdfIn PDF document text
    • http://bienbao.net/uploads/files/95110953056.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/258a7ef3b600fc6bd94e23fdeadc73e2/45159520900.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/98015287401.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/35416220965.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/flcfsbn83begmk3gdq7s0l77em/bimafiwofidolonadalazak.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/c5n4iug7rjcq5c6764ih66ffre/16783146995.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/pajaren.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/xakewalefi.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/c55844ae6e0f6637d5295767cd8a6fa4/72124742442.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/53597442056.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d107d11f20---51235068879.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/kodotuwegimobekazojogor.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7237883d58322c58e8929ce2e6259191/beregizusedudimariwu.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/2c321c85d1ada0d31da4ef1021ce0e6f/fekulezile.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/danirubonigurenebalefu.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210526084403222.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/5329fdd4a40d8e52a657cfcb40921b7f/79994024686.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_off0000e252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE252 17304 bytes
SHA-256: 36673e6ee38ab34bc7556fc8f8fab17196ad5929dd904e3ee0ac0f8256995342
font_01_sfnt_off00010f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2A 10912 bytes
SHA-256: e85cca6f8b4fcf77e3e52b07911c9f33dd4b3dd39142b7d345b5ee4fe9ba4e09
font_02_sfnt_off0001283d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1