Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb72cc672fffa6ae…

MALICIOUS

PDF

98.5 KB Created: 2021-08-16 23:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e82bd6ee62d792fc5ad9c461dd9c9bbd SHA-1: 03476316cc74227a44516c7b72e25f0a0e3bf144 SHA-256: fb72cc672fffa6ae8152c4d5203a24259ec9b902757f1eac6c7f7003794233c9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it directs users to malicious content. The presence of multiple unknown URLs hosted on various domains further supports its role as a distribution or phishing vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c7baccc3d7f---57007803307.pdf In PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073871e5e3d3---xuwotobalojevalikoni.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/385bec9344acba6e2c7cdefbb8e4a7ae/52809486747.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/70261919204.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/3bef5708f65c511a4cb32e08e5f648b9/87291017100.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/7b29dd493bdde07b19eba6e70671fac2/wijofulabixawiv.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/kututomorabugusitib.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afd0e7cf97c---pedowagesumijikekevoz.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5277dc7ccf---22981755741.pdfIn PDF document text
    • http://lueckerreunion2020.com/clients/e/eb/eba09433058400eda594a485f9004317/File/solufem.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd080ea1b50---notuzozezuninifered.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/rexudonemolakix.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/j5e5b46665lt74gcss6t4a5897/misipe.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/93106879258.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610a95af6f074---70349614000.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/46835115183.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/34a3f7b9d4040c75b38ff5fb0dffadc1/49146874032.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/81581168180.pdfIn PDF document text
    • http://npas.ru/pic/file/migunamufugawukenelapoze.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fec816a77e---pokodi.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/873ffc60f132ad5a1fbb441a81f8fd9a/64713894707.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/rimijinixema.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/79196852223.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/h722eg150s0fnes5dtomi3v0u9/70285420126.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/52149262306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=apba+carded+playersPDF 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_off00011cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000134d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D6 10328 bytes
SHA-256: 91955215c46ff26d793e340a22b9edcba81bf55f57b44f619b2b7aff2aeedd45
font_02_sfnt_off00014c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C0F 18328 bytes
SHA-256: 8d95603deedb60dcf3deb492603748cbce017fe351559793ca61995894ab4ef1