Malicious PDF — malware analysis report

Static analysis result for SHA-256 a594c271bab3318c…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 05:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f3d8a5a124b00aadba7e21fd9b099dae SHA-1: b74a968958bb225d589fa716968380a0b1789630 SHA-256: a594c271bab3318c7fa5a9d4a2a708dd7cc37975d1e50790f2d8904f6b1c2399
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm for SEO poisoning or phishing. The presence of embedded JavaScript, although not directly executable without user interaction, indicates a potential for further malicious actions. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=nba+live+mobile+unlimited+coins+and+cash PDF link annotation
    • https://bjjewels.net/nbloom/fckuploads/file/kasufivupigu.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210904161037.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/45525222302.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/64918270111.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/50811529981.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/takitakifufupoxawavatako.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/7940616049.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/pojolifare.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/jatowavuzagajiluza.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138deb437833---kebubu.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/21642729506.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b91dac87b3---xaxamidazu.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/74800750418.pdfIn PDF document text
    • http://onhimalayas.com/ckfinder/userfiles/files/29635448701.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/pulatotobefujoxen.pdfIn PDF document text
    • http://twilaw.com/files/files/30517009481.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/zutezasakebigiw.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/68154182500.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/mogujutowelataxuposepowaf.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/sunoxowobobebaw.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b35c033185---juxabekakirutunudebupin.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/sanokabaw.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/34455469749.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_off0000d723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD723 10820 bytes
SHA-256: 759f5eba46531085c3cb0e64afdec623552f7c3609cd038f702a1bd4e43baa12
font_01_sfnt_off0000eff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10802 17652 bytes
SHA-256: 6c6b9fd68bac43fe207f1c015eb4bdacbbde2e61a65b6cf16b781e2f5bbd4e81

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