Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d9d7065b9e71744…

MALICIOUS

PDF

67.8 KB Created: 2021-10-01 06:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c9329f5029aaa8f34058e2bda80363d9 SHA-1: ff78fcef5f70dab68a3b8aa247c27d8622a48eb3 SHA-256: 7d9d7065b9e7174479dd4c77742d77b0dfa7ce6b04be98d6eca657bc3ad487f0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, and detected by ClamAV as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://nomylo.ru/uplcv?utm_term=3+ds+rom PDF link annotation
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/up1vashuqg2vpbskliavmrkk50/pukomisoxebefetowenal.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/biwusisumajojumori.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/dajedejefidoselirut.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161494a879d7ad---jikevapujelokajiwawutil.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/33472601601.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/2820767020.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/xeluniwekujofikarepelevu.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/17034262631.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/xojorubozi.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/92610363311.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/50358798060.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091913585173499.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135221f2c537---55208368880.pdfIn PDF document text
    • http://devveb.net/userfiles/file/mewosidodutoxojipavamutud.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/werorexu.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/96938173054.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/polatixilofasijab.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138751d54f38---92276707.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/q0qoknjbas5lef93tprpsu8vn1/kalenoniwixoraginiliber.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/50020448421.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/61298290423.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_off0000afa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA8 9852 bytes
SHA-256: cc850f334c7a109c9772ad62ea4d18e2cdfc1b4b26a107228d4127fbacb7f0f5
font_01_sfnt_off0000c53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53D 14688 bytes
SHA-256: 81ecd9385d2913c035c37623d085a53699de0dfc38fa9eca0b5d542848e87f56
font_02_sfnt_off0000ea2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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