Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b430fee1e30253…

MALICIOUS

PDF

79.6 KB Created: 2021-07-13 21:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e4f1f5274d5dab55e055054d72a0d0fa SHA-1: 8500a49fcf4ec935ba340ce3d90eeaddd43b0773 SHA-256: 88b430fee1e30253458d8a5c3406ba5e6126dce37e76541d0eeed493b0d2e9c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of multiple compromised URLs indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/c7092c710f6242c028d6dfe4d71261c7/18802274613.pdf In PDF document text
    • http://hoanggiaphatstone.com/upload/files/gajozubesonodaxoxosi.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16076241e71ba0---6966098477.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/v9nn5db7ivp0gdvvfiub3f1t1e/komejeposizazik.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/e1b4888bf714122b99091992c0488434/44318983890.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab5e661499---41927350654.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/11766518238.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/89509b23474e5c2232a772b7b54c54e6/girekekavajukigozuz.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/26cd10bdb41a4c06c6fab7802edfd2c0/2809932551.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/299dfe8f9178790cd4b07298403af488/buganepomoded.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/5fafb6445eb21a279fb594f514cd88de/93157780966.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/03895be69e96f5a3e7a247afe674572a/72361343904.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210710_60CA465D5E2F6F33.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/zamagusak.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/3b59ef8b57250072d146deeda14c24b8/kogunawenogudiwevufagofo.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f8977f98e---79643662344.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/59589775810.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1ed83df225f5b5dc71f503f5e2143810/27566753270.pdfIn PDF document text
    • http://fitviewer.de/files/file/gugafudimik.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/bamub.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/mufizo.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/vuvag.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/kn3j19mfb0i4f52ugil2q1rq3e/rabepelebolosidowakopo.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/78408346698.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a866aacfddd---jupifokenog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=candlewood+suites+dfw+southPDF 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_off0000d573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 10568 bytes
SHA-256: 58fe5bb80eeea151ac0ce9de175f64bb6b360c239819120f7c69643142f83aa4
font_02_sfnt_off000105ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AC 16816 bytes
SHA-256: 30356f54a23e3986de72cf328579df1dbbd9d7cba4e3afd91460b39d81cf00be