Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8eac754e14403c…

MALICIOUS

PDF

89.7 KB Created: 2021-08-25 21:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 27a3009f602cf4cfe68c135eca2b950c SHA-1: 451f2512877e8f2bda30c4b148d43f493c98f9d3 SHA-256: be8eac754e14403c19c9100884cce2afac087318344d5481609f18441073298c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous external URIs, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7a36bfc75---73868668559.pdf In PDF document text
    • http://concept-art.nl/app/webroot/files/userfiles/files/9922366768.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021080416051797.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab463d546---30065951964.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/78e5011e161a3617f11a93043e5db0ff/8186722534.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/sukujix.pdfIn PDF document text
    • http://aimic.com/userfiles/file/radigizelob.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bfe35416a---71811650008.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/2248fb075d6edd20e6bc421ee2b40d0c/wozivuvukoborulerudopok.pdfIn PDF document text
    • http://hghs61.com/clients/9/98/9814c5f28b4e93efd1f74733a9fd6b0f/File/pusimudabedasipafagodos.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873e4519815---reguzatotopetamorezemomim.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/98587848476.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/pituxi.pdfIn PDF document text
    • https://combrooncom.com/contents//files/87275376571.pdfIn PDF document text
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/63205420115.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/08/03/43772516522.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160e93592a91c1---nebif.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc3d83038a---nanode.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/77320124299.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/61804142780.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/mivezijidu.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a53691a7407---mosapozazalalogezirejifu.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/17929914099.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=college+application+essay+structurePDF 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_off0000fde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE5 16328 bytes
SHA-256: c9213367bfdfb80309bf1f99e095f4071b964907da4fa7b9ad0aaefe1a335108
font_01_sfnt_off000127fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FC 10792 bytes
SHA-256: 204519d6ac31f63b12026c94888482b3f31e461041901dba1823654366352db0
font_02_sfnt_off0001410f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1410F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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