Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df2d2152bd9a0fd…

MALICIOUS

PDF

87.1 KB Created: 2021-07-22 01:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2e8bab8707ce55c6ec7239a42eab63a3 SHA-1: f9051f9257617bc993148412f704dfd2985ab53c SHA-256: 3df2d2152bd9a0fde40cf2a79686097ac159e8cf8f2de9ce6bc3b1d8845a812a
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised websites or domains that appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis suggest a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://tecsun-moscow.ru/docs/file/daguguneraf.pdf In PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b070961a7---29974316113.pdfIn PDF document text
    • http://airsoft1.ro/files/file/93103393178.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c8a45d870---94787277816.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/bubozopesusirer.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/1191121351.pdfIn PDF document text
    • http://iltorg.ru/upload/file/ninuzikagapuxizewun.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/tifotefokugikepomagiboka.pdfIn PDF document text
    • http://zlato-stribro-investice.com/upload/files/baresila.pdfIn PDF document text
    • https://ebooksweb.net/files/file/jarojepazedapumagobomosaz.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608680b7405c6---63282051074.pdfIn PDF document text
    • http://usagimatur.com/files/others/24839322708.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/91222417187.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/2055455519.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/zopodevonutuluxexogukuk.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/c46fc2d2534126683c33b63979754964/29414662171.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/464cce11fce6dd20090b5bb310c14c01/zamibesozilirax.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/7oh5m5dkjtc0ann4v1u0phf7i5/34953740853.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/af2f040eecfc1d3c16a86ea97d08b571/39922981577.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/b9dq15ndbmd1t4eq5clfo5m1e4/31398808679.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/naxemixodivefulasuzut.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a303469c4dd---27282527282.pdfIn PDF document text
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/xamalibawivenilonajupo.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160753e31c9949---78855712306.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da9c8bbd96---26201232612.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/3dab19dd05a6baee425cc5afd9c879f1/risawadumet.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/fetonotedotowozimolan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=formula+to+find+common+difference+in+arithmetic+sequencePDF 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_off0000ec94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC94 17604 bytes
SHA-256: 672166e088c0ebf064eb8a4fecca40f79428a6e0db554aa467f676b0f8f04934
font_01_sfnt_off00011aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BB 10964 bytes
SHA-256: ab727491c608da5440ba65327cc17e9f3bdbd0ae3625c595c30ecc89cc5d6aaa