Malicious PDF — malware analysis report

Static analysis result for SHA-256 074a377cfa709987…

MALICIOUS

PDF

79.7 KB Created: 2021-09-13 19:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 19978b45c6bb6f1036efadf6cb96bbfa SHA-1: be5c1d5dc9ef220696fcdea7861b7a1055a2e5ac SHA-256: 074a377cfa709987e34827699030e9beff4378ec8618d54cc619398c680f2608
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm or distribution mechanism for further malicious content. The ML classifier strongly indicated maliciousness, and the PDF_RANDOM_URL_LINK heuristic further supports the suspicious nature of these links. No scripts were extracted, but the overall structure and link distribution are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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://catamma.ru/uplcv?utm_term=xvideos+downloader+apk+free+download+for+pc PDF link annotation
    • http://silesiacapital.eu/data/file/4875989818.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/korijotiwegoxidanolape.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/karolafosurejosoboseb.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/xabipadu.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/munekopimetifa.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/46613134581.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16137ee3bd299d---lojir.pdfIn PDF document text
    • http://freetds.net/userfiles/file/kovobojil.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/1935129209.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/suval.pdfIn PDF document text
    • https://bak.vn/upload/files/pasodikonamika.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/25108631017.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/jufapujomonoxasugazuj.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210905024839684.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/42296230227.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/59141623478.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/42455300077.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139a0ee936b6---18073367844.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/gejokejikeveviverejilafa.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/49273800634.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/puvazi.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/55850085555.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/186461f2f3f134596bab30d3fba33a41/12139156629.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/57247951834.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_off0000d2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF3 10768 bytes
SHA-256: d5f7a492d982242f891c0def80081850460cbd75665317197376dc594e2522af
font_02_sfnt_off000103d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D7 17492 bytes
SHA-256: 080a7b3c71fb944e1ad50c9c34bf3e7eba178ed1bc7dd72427b9cbc9a9962e33

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