Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef641cc2cd0fb5e…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 05:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d7d526577880ce5b54baa0d4a5d14503 SHA-1: 573b3a5d2ae440a651fd875dd556bc2bb4d3a620 SHA-256: 8ef641cc2cd0fb5ec92177398d8ec763007797b82b6f131e5b7b2b1b33b9db6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing a link farm pointing to numerous domains, many of which appear to be disposable or compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 https://tkquiz.com/userfiles/file/9545518192.pdf In PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/bexetagukiburolopulekezes.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/wanivoseb.pdfIn PDF document text
    • http://talleresjpg.es/img/file/tipilimatovupid.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/66407980192.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/monomivepinatug.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/402b52c85bea2f6c76871bdf8e577f24/fugebiwi.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/b4512766a7393848680174bfbf297847/10187649378.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0bec7c208c---lixudefevugawaruvojego.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/2692bfa65e0048849f0fc298d085f965/xogil.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160846053da3fe---wavonugojibak.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/783a952fc0a8e776eba257c256c06a5d/65729005836.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/dazowufegosepalajo.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078599a4faf6---42417106702.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/11351636920.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161197098e887c---dafix.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/f0b0b8d8ea8be8946b7c11745e5ab2c8/58816210752.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/61010579542.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/4724068205.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160838ae7a8b7d---16288832798.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/tejogupojiwarunosoni.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/tenusileputezoz.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160796610561d4---36090833497.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/25930915107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+idiot+brain+download+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BC 17184 bytes
SHA-256: 0014a683c390e6a14983e26e2063dde11812ff938e0bbbfd83a7b7a404253552
font_01_sfnt_off0000f5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B8 10616 bytes
SHA-256: 5931888638538e30bf02cdbbadf1ae57653d56d1a5a96779951f3c5e2501cb90
font_02_sfnt_off00010db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000125c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C7 16632 bytes
SHA-256: e896d0c9c6509c93731645541c0836c845742b74f7fde2e8ff5e94baacc6a6a0

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