Malicious PDF — malware analysis report

Static analysis result for SHA-256 7304fd6e71df8a3a…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 16:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 136cc4a28dce8dc955ad2c3b02ad87fb SHA-1: 084423b528e1f3c6b50dd0e62256f6c17b9ce30e SHA-256: 7304fd6e71df8a3a655bc37e5496a9be06fd61ad359489e52fe35616db26ff36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=how+to+turn+two+photos+into+one+pdf PDF link annotation
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/370f68baedf14eb6f9765739cdf47949/22416188414.pdfIn PDF document text
    • https://beaszemin.com/files/gerulabagifanizijiripe.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/10669071634.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d4261151d0d---vufatomita.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/ef821fc9290898febe7cc6c5d53c180f/75010500286.pdfIn PDF document text
    • http://www.heatandgas.com//EditorImages/file/37795320935.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/a25f8528941e182d8bebb6d7796dbc01/1703935383.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/wesijiwavorexizu.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/52756080697.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/lizom.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/48406602126.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/1e0ju6m5tb3n0njs9h6mru5033/15791429007.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/zovuzogodapawez.pdfIn PDF document text
    • https://parc-hotel.info/file/12653638154.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/vegogaxofixipog.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/putagizejufatapom.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba698b9c10a---zenazawaxizogozodepenos.pdfIn PDF document text
    • https://red-adlay.com/upload/files/28935419073.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079a46599ce4---jafuwuboveserobilajopu.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160815fca987b7---kedeta.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/333b0b72718b0e8ea80118cac47ec7e6/sigowekakajagosurolu.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/hgehg7qtflcichi26d07nbai61/8543921828.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_off0000e050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE050 18432 bytes
SHA-256: f578719b3bbcd10d7153d382ae3f59d200a502ee675066bd2620b0cba68a5fa9
font_01_sfnt_off00010fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB6 10564 bytes
SHA-256: 2d4347fcaa423c040d8856f088d4c4598a9cbc6a8586027c8097d23cf1cda783
font_02_sfnt_off000127bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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