Malicious PDF — malware analysis report

Static analysis result for SHA-256 1864c4dca6dab59c…

MALICIOUS

PDF

81.7 KB Created: 2021-07-19 04:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1e9e3418683a8a52611e9987b913a22c SHA-1: 06758a80c3d725484465ee69049133120a57b41a SHA-256: 1864c4dca6dab59c3d3ded4151409decf548ca5778d4925c587ff77e70bc77fb
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple PDF files hosted on compromised WordPress sites and disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous external URIs and link farm heuristics points to a tactic of redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca30d119f3f---32386285737.pdf In PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/15337b43e5a94ff4c87f100feaeb6979/54877685851.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/56064086041.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/69094185644.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c396bbe46c11a9beefba86ef54478356/robowejelisosobezeke.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/19667575292.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4d29560e4ba425f1a7bb35c1fda5d203/vutomufij.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/e232aa8ee32d6978d3364521c5a5db09/dofuwasipu.pdfIn PDF document text
    • https://arerp.kr/data/file///12346216129.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/478da70cc2a0918cfc799cc386be3771/pesijixofik.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb47935ceb---68457357128.pdfIn PDF document text
    • http://elitvorota.ru/f/file/vikapotuduzojefotudowujak.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/nobax.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/74683914156.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b516c6c9434---90458311196.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/5168a601e4269edf957d7a1c118fc1cf/vumuwaxobinefelili.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073351811b3f---zotawafigudatinapem.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/71665807257.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/lobuvefimimuretadedijuvir.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16082944ce0eeb---zalifit.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6ff7fcd1f960869d6efc6c3eaf07d094/pukabukezebojixitilogex.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/b7f49a6aeb070dbe37636621f7dc7664/temadezomu.pdfIn PDF document text
    • https://vestol.bg/files/file/81864682299.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/0733e2e3b87d5467e2ca46e1563576bd/kaziremefipilibasadipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=chapter+wise+test+papers+for+class+12+physics+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADD 17000 bytes
SHA-256: b0fb01e66800c2c5e0728522b1a16640de7fcb38c3f212a01ae675f4be1d2d2b
font_01_sfnt_off0001070b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070B 11016 bytes
SHA-256: 7fcacca54d8e248830c8b85ab197bdbd69eac0e3d36ca3bcd8bf50a836f14f9c
font_02_sfnt_off000120fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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