Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9dd113038cf5530…

MALICIOUS

PDF

84.5 KB Created: 2021-09-08 20:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 83d03b3462113799cc0e3e5b93a2572c SHA-1: 8442870f229baa6597b780a7995423caf00c0c42 SHA-256: e9dd113038cf55307eb7b359e78da0107b469cb77a54d750dc586af6c85ceea7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and heuristics indicate this PDF is malicious, specifically functioning as a link farm. It contains numerous external URIs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The primary purpose appears to be redirecting users to potentially malicious content through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pixomot.ru/uplcv?utm_term=matematica+financiera+anualidades+ejercicios+resueltos+pdf PDF link annotation
    • https://suavitinhtannha.net/upload/files/15426191930.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/96041970185.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/30438490931.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/65531570518.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/sozod.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/kowedoletosupubis.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/30580548533.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/42a06b934b3157bbebaabe092cce8dd5/19971305611.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f910efbda---fotumamemitedesefu.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/firelixedugozobuzito.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/napufosonesemenapujo.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/kabosawovofegofa.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/betipapepemegome.pdfIn PDF document text
    • http://nscenter.cn/upload/files/wajemubelebovoxaramoloz.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/mivumuzuvupewos.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/6092961568.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/25785cd23cc7dac100c066c72d197105/6236166663.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613318fcaad5b---wesedosezotadebuw.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/fujogaxe.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/31150811904.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/8729127566.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/10064303397.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/pinamukenojizokopiwev.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_off0000e387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE387 11004 bytes
SHA-256: 37706f33222d4564632c3a696b163f58f12efe3909d97eac32774aa4778f408a
font_01_sfnt_off0000fd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001151e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151E 18356 bytes
SHA-256: 5897fe3cb0957c355f134ced416c1e3411698886fc2715f0d2a9a1042deb113c