Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9b637541022aec…

MALICIOUS

PDF

90.1 KB Created: 2021-08-09 05:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 984926f84fc1334f5d45a5252b7cb880 SHA-1: 69b501c4e74c7296f3277612c72ef4f9d111e6a0 SHA-256: df9b637541022aecfd58c6b87d26768a05387913fb1570650dec7f851531e17e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous URLs hosted on compromised CMS platforms and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://zpb-maciejewski.pl/upload/fck/file/86875233657.pdf In PDF document text
    • https://retake.dk/ckfinder/userfiles/files/buzufixum.pdfIn PDF document text
    • http://risme.vn/files/zuwajada.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/36b08a9f92d776c09f331dd02939182d/4333914514.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/38dfc71b932d95d76615b218e8204849/36487462774.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/3487ad464fbbe373db7d65a7a34d0e19/zifinuwilugigivolixenab.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/0714f8098f4058d4b9f1540c910755d2/33685908286.pdfIn PDF document text
    • http://d4scanada.com/clients/8/81/81a8d3ecf29e0a7d9042e8364394d873/File/59536425511.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/lufaxovitixogulimidobol.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/tusiduve.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/boxuxiwekenozoza.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160accfaca3d07---78367063886.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/todizikesisarawojinom.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/62058081340.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/6734927365.pdfIn PDF document text
    • http://kunbot.com/upload/files/71561710614.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/77300422950.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/menalaki.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e769e2e066---46026519913.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1c0a158f5eae847aa0b99077949f4947/80616722860.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/sco82rivd629k6jurk7gt4skp0/80750131133.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/52389548518.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/9801a7fb9f3cb1bc56bb0f1615b26d85/kexajamaxewiwiw.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/silixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+install+samsung+microwave+above+stovePDF 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_off0000fae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE5 17524 bytes
SHA-256: 9a4750c097c219c85e958f2675dc20281866a07d525bf8bfa8206273380d4366
font_01_sfnt_off000128a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A6 10956 bytes
SHA-256: 6a54605caad723644246cd2544cb428eb136d0758d6ecb0a195ef28dc9c2d3a7
font_02_sfnt_off0001421e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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