Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c533264f6ddce0b…

MALICIOUS

PDF

87.4 KB Created: 2021-07-05 08:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: dcc0076b67445222e3fdf35dc82bd56e SHA-1: ac1ee442d9a8087fc0d621d1f6d0781335543348 SHA-256: 4c533264f6ddce0b4ee0c0bd4f3908fce8510b4541b419c44061030ab4b4bef2
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6c4c606d7---62033294285.pdf In PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/bq6555iau9rduvjhvvo5qhaigb/82470326186.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/336080301f75adcee4fb12255dd9f928/xosonetogizaroda.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/77307762318.pdfIn PDF document text
    • http://wallsfamily1912.com/clients/876683/File/lukufonu.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/vadigaxibixeforelul.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/d3936d5da428e8c22f8bd4e2551c8b88/semowosilakux.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/3036ed80dc1d8e55ea576c4457a243d5/33696258297.pdfIn PDF document text
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/59545218550.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/8ip2n2ql35ut7noijc30iatvh7/49055765314.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/dazetego.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/68376455766.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/b652905650c7b42414dc3d15b8f24aaf/nipewejorobesibi.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/km80qn8mcdqf3bg03pjcuekhuf/59126527252.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/cdfe5506c01fce8cbc92fc5b61aab8b9/81539538800.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/5794b594459137fa3a8b2dea030ad22c/zugolirapebajer.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2dae15042---1446163465.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/5be67f0a86ceb5edcb8ada46d9f0d85b/56677365525.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/9096b7ba6dfde6ce54c7ae9b9f06885d/68033762636.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/84c676e4120df23b3eabd7bbbf411a42/3722904818.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/68210844685.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/79577191519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=stomach+cramps+every+morningPDF 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_off0000f4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DB 16288 bytes
SHA-256: 15286063d421dbd2f361ac4edf31d762ea2f08f9b208e4f37f909c2559a661db
font_01_sfnt_off00011ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECE 11032 bytes
SHA-256: 75124842ac1b825a051fdf679b16c256e786e95abc099d0e0ba946087f34fcd9
font_02_sfnt_off0001385c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1385C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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