Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f24b68e1e7a3761…

MALICIOUS

PDF

83.8 KB Created: 2021-06-11 15:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f616ee4aca6db33dce5a48936ade92b5 SHA-1: 5c59ae1eb1ea93e543abac236db9826e8e039ed8 SHA-256: 6f24b68e1e7a376126b76516b5c379eccb92c06513ff44a625c0bdae34cef9f0
136 Risk Score

Malware Insights

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

This PDF file was identified as malicious by an ML classifier and contains numerous links to external websites. Several heuristics indicate these links are part of a link farm hosted on compromised WordPress sites and disposable domains, suggesting a tactic for SEO poisoning or directing users to malicious content. The document body, though heavily obfuscated, contains text related to 'Decimal addition problems with answers', likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=decimal+addition+problems+with+answers PDF link annotation
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/6fd29e09c25d7f3babea8455c02ab1f2/94625797985.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a64b3ff3e36---44827664933.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4fefe2ff9---fugeluzavog.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/6668652613.pdfIn PDF document text
    • https://actor-conseil.com/files/file/pagexagagowizujudawiposag.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/3c02092e60e12870bdb9caa895bb2054/89172882869.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/5j31riifb1u338bd1g9tg0mote/xogaxigizekunenepadivaros.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/nowajaxebefi.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1e15f96fdf803274a6fa586103e84727/botukanor.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e2b8dc516---xavemumeneworuzefodew.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/8b2a721409659aea5d1a65b5b2abb361/bizur.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/7lb7tk94natdrf0eski8nfkak0/viwejalakaragonexazo.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/1e2d2fe5bee3d9e4d0d5b10fbeceef1e/netaxasunonezevevoxiredix.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e023a333b---41658428718.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 5544 bytes
SHA-256: 136d70d2cc64573986211ed8e5e1906fbea0be539c8aa71f27af33eca8aa54e7
font_01_sfnt_off000106b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B2 10700 bytes
SHA-256: b3e850cb99e3271e4d98322028fdadd86cb2d5b2567ae5679548a3fe454144cb
font_02_sfnt_off00012b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B65 16088 bytes
SHA-256: c487aa01613208473e3c0b892de3260687b9c0341624d6c76d95d7849508583e

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