Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6910bf12307c55…

MALICIOUS

PDF

72.5 KB Created: 2021-06-29 16:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 556ede4993752fc62f9dec19d12975b0 SHA-1: a0bde05526c2c892bc16d1dc5fd51f787c093678 SHA-256: da6910bf12307c55b3ef8df915f82c808d1a605670afdb7ba0881dce5966f656
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to compromised WordPress upload storage, designed to trick users into downloading further malicious content. The ML classifier strongly indicated maliciousness, and multiple heuristics identified the document as a link farm on disposable hosting. No scripts were extracted, but the structure and URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dad815bb483---49187021068.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/bfcc3e24a0906179c143d982e6c16617/tidazexewavogixiperinedi.pdf
    • https://srmhospitalities.com/images/bulk_images/files/22178735497.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6c785a14e---69968577539.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ec8d856c2---42620264674.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16084d7fa31f95---popazuzikafovepasezalalat.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c1e7486c4---35297522768.pdf
    • http://tbff-bygg.se/img/files/56959424175.pdf
    • http://stacjaregeneracja.pl/userfiles/file/peridunofavesevalej.pdf
    • https://clubon.top/uploads/files/kijexu.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/04842bc7e8cf4f14b63616f0eaf98312/fewesupopidikodajoxu.pdf
    • http://minerva-collection.net/files/files/30307260883.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5e8a4dbc9---66924943179.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16075cd26a9d21---28937382237.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a44865937---59939731091.pdf
    • http://nowyhotelik.pl/userfiles/file/gapaxizorutosod.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9bb3dcaccfda6277e20c10b932cc40a6/vusoz.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/1a83255559d39a1cf2376588e9dc2375/22875000050.pdf
    • http://df-foundry.net/d/files/93943620370.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b48384328d2---fevate.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/b808cc6fd484b8cf83e96cf83524be9b/zevelifeliwevavafu.pdf
    • http://abwplazaview.com/uploads/files/fagavazaxekodatov.pdf
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/kumixe.pdf
    • http://dietetyka-24.pl/images/files/buputafo.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607007070d6c7---xefoxetajivodafotakigi.pdf
    • http://10glazsikeyrosa.ru/file/88151702028.pdf
    • http://xn--e42bt3l.net/upfile/files/76840893194.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+read+p20+micropipette
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd11.bin
7b0266a227431594c1be06ad599fd6e9a8e2a250a786b82f5730711b2b88d7e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD11 10676 bytes
font_01_sfnt_off0000d598.bin
1edd8104d8c60594a6fb4df8edbf1879965c5c91f9fd3e5cb0dfe0a7985a9a3a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD598 15200 bytes
font_02_sfnt_off0000fc57.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC57 16792 bytes