Malicious PDF — malware analysis report

Static analysis result for SHA-256 563c462e76eddc45…

MALICIOUS

PDF

83.9 KB Created: 2021-06-28 05:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9ef9b2aad1a6e615fff25b42cefd2e84 SHA-1: 6ca8346be12085cb4de539730e3df109e8b94da7 SHA-256: 563c462e76eddc4517f61bc4f0b2973222eed3aa4ae3a9200d2a034d34cc5ba4
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress installations or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly supports a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607744a1c1e35---wurezulef.pdf In PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/25529993406.pdfIn PDF document text
    • http://abc-tel.ru/data/File/91175502762.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/d1e0fa075eddb5975eb6689113500079/nofemosolakenimosikifasu.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072913d8b040---jopijabu.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/clfsnd5lesvrpf642tb6r1f6s4/dazeliveletoxifak.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/gezepowesenir.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/89ktnjfme34alf4f5fs4coe579/62772797250.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/493aa11d96c38a96124175d0f864b630/lebotadezegofasuvado.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8279aec728cb2f3a315d44d78cb0c8ef/97297097424.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/rejugugepoxalofufimufo.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/90004256135.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021060922545571.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/a8ccb355429909096d313ca362c3ea18/62830662417.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/bb78ddbaa099dbf078786aa243ffd140/levepowotegugimafuda.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160703728e510c---52415380186.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cc1662b88---55288428529.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/17973634278.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/ritepoloxujeb.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789772a1e59---94439899025.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/zixewomepadafeguxewul.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811b834cade---67297123980.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9804a6f44---50685694954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ladder+of+inference+modelPDF 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_off0000e6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF02 16676 bytes
SHA-256: 983670dd5ceff0c1dda08d2334ed894b0031e8c46106c0cdf900420f435553bd
font_02_sfnt_off00012a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A00 10328 bytes
SHA-256: c8f1810bdaa1bc45f04946e07f98a934a7daba4d01f07f4047446c9f404ff7db

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