Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e9f742e1cb2ae9…

MALICIOUS

PDF

73.1 KB Created: 2021-09-03 23:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a94cf5ce62ac30d678d5653b89f8dbd6 SHA-1: c9ed9ac766cec475f47c47eba94cc0fdb4771f0b SHA-256: 39e9f742e1cb2ae9260c5c3fc8931d499ded2e19e043a3790019cf7fa6736a38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm designed to distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. While no scripts were explicitly extracted, the structure and URL patterns suggest it's intended to lure users to malicious sites, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://irlanc.ru/uplcv?utm_term=la+concentration+molaire+tronc+commun+exercices+corrig%C3%A9s+pdf PDF link annotation
    • http://aire-limpio.com/img/editor/file/sulomivolujazolizowejila.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/bolibalebumutizifakinudu.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/46364346038.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/44338338685.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/3b60iqufp7emfesvt1t2haoap1/23440611384.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1fa9ada44---puviwumelelibavizobawunig.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/96033306664.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/xorotipetufipikizib.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b300c435c76---65237437086.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b40f1e584---94819128720.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/61444880884.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/24471900238.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/29629934231.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608dac6461742---94200186925.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/57137370658.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/103985ffdb49627ea9fbb07f6732bdfe/7311539349.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fd037c304aa---67345770752.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/duf12nmlernimovdq9bp5l1o9m/sepefekaropujazavoni.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/bidowatigitavekupiloxumi.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/76502704907.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/kixaliji.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/86147102409.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/91793587540.pdfIn PDF document text
    • 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_off0000b5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD1 11276 bytes
SHA-256: 3910f74bd038ec1e43eae7e61afa2691c898025cbe69812360c36d7b8f16ffac
font_02_sfnt_off0000e7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CB 17384 bytes
SHA-256: bca5211d7672f71b3ddb67cb8c096b7bbebe8b2306d5016340e25db1e036645d