Malicious PDF — malware analysis report

Static analysis result for SHA-256 58754334ca69850c…

MALICIOUS

PDF

67.9 KB Created: 2021-09-24 17:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6e2415c2ea66d832a6ce22c5c099ca0e SHA-1: 574dc83bdb9430eea6b6295b54dcf8d0bc86267f SHA-256: 58754334ca69850c480a64915b01235a327e056071fb8e7ba508e2cee4bca1b7
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a screenshot lure, designed to trick users into interacting with embedded links. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://tonwen.org/userfiles/file/29462372702.pdf In PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/fowadazuke.pdfIn PDF document text
    • http://safarang.com/basefile/files/74925503353.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/72762170846.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/a401d4bb0a4f796e7dabe86e3b22ca4e/fojuritirujom.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/fajafememu.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146b3fe7851d---93683207031.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/lizafugi.pdfIn PDF document text
    • http://fourfoods.com/images/files/7556533613.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/f19e7968eea96e35d4cbdadfd6e4ac28/vopulanujakaromobasarugi.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/61470883767.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/gugakafikeligilivelu.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/0a9f6bb01851ec84d03cd1fce3da0212/75949243796.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/a6272750cbd3f60cf20d50244edbc7f8/35418594050.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109091122589078.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/20446432433.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/85612284293.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/wunotag.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ab8704c18---sileweda.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/1185636400.pdfIn PDF document text
    • https://www.confirmedtour.com/files/87315832617.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/4314892259.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/6532731261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=add+font+in+androidPDF link annotation
    • 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_off0000b184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB184 9980 bytes
SHA-256: 081f2a85c4bb0246cf6945113b4e59d4c48d8d4e1fee733081dc6698d0555084
font_01_sfnt_off0000c7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCC 13888 bytes
SHA-256: 13371a03452468088f34dad61a5d01bb0e48aabbcf335c335d106848662b14cb