Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed9d30883dcc495…

MALICIOUS

PDF

88.9 KB Created: 2021-08-07 04:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 78e623bee10355900198e95ab7b4f32b SHA-1: 615109df60230c4436b219a5a446b3967b05e80b SHA-256: 1ed9d30883dcc49574fbfe160c8e6803311488ade05dbdc0b5b9ecfb90b7cb62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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, with many URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The PDF itself contains no readable content, but the embedded URLs are the primary indicators of its malicious function.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://zge-led.com/luodan/images/userfiles/file/94529473614.pdf In PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dd112e1110---rakodiritiw.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/32219764719.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160757f43b0edf---97048464276.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/zuzejejofevew.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/832d7a20a29695aab4daf42799917cf6/74647184408.pdfIn PDF document text
    • http://ledson.ru/upload_picture/fupozomizo.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/sovez.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16106552fe7ea4---50775540983.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/3d5o2l6hitsgteh068e4shnsir/89703985752.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/raxijirowudekinezapobi.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/99695589194.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/a51e27bb74e4cba2f119f6eb98651572/tojoxozofasetedonifides.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210621_FD3D6180B7581C33.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/43713241438.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/93b480c2d91cc4102b0089521c223bd3/piveju.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/zoren.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/0b8a30820d1ac0c355d62f33c60c1314/resizapedivojikekufatet.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/58876272596.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/u4c6dckp9ah1vaoneu07u2td2g/sopimemubolatudero.pdfIn PDF document text
    • http://asfalon.com/__files/file/beselibewixakonem.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d11bcd084---zuwiwa.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/u5bln9rthhgcc5q682cehv3qod/93176493057.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/nivurupaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=kamasutra+literatura+hindu+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_off0000f60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E22 10732 bytes
SHA-256: d1af5b746f658b041b160ce016ffd7ecf58d10dde910e805ede21021a3f96ebf
font_02_sfnt_off00012687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12687 18792 bytes
SHA-256: 593ce4fdeb6965ab8d4ee7f5ce70cbdfecab79de7387b07667a61766bdc7da0e