Malicious PDF — malware analysis report

Static analysis result for SHA-256 189fa0ab75aaff1a…

MALICIOUS

PDF

87.1 KB Created: 2021-07-01 19:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 51d5228e5d431aed857666697da73275 SHA-1: 4c64a294eb8e818e3252bb360f378cde06e4e2c7 SHA-256: 189fa0ab75aaff1ac015bd90c9667c248818d30f622ea53c147cd5d608ebe222
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics suggest it functions as a link farm on compromised websites, directing users to download password-protected archives. This is a common tactic for phishing or distributing further malware, often involving embedded JavaScript to facilitate the download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/91080e2a375fdaa142ab7303194d6fcd/kewagexonewejet.pdf In PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/c834c71106f8b93e4e0c1c1c4d44ff4f/15765048472.pdfIn PDF document text
    • http://premium-h.info/files/files/gikowizap.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/86347919951.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/4767q2u6s52pt4pg2ams51dvo1/20226785975.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/ad301346de04511d86ea50621cb2e9d4/jogokopifozunujab.pdfIn PDF document text
    • https://promise-land.com/upload/file/4176495211.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/74590284663.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///biwawolojuva.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/28242616477.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aefc39a1a03---viluwozofukej.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/186h310vhnkl3vo55b654c0f77/tatudekavekedupasimeteton.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/8bae999f2b62df10f46c601974de30b2/giwasoveb.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/sovuwadigaruvu.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd64d9d8e0---fijuraravizipaxijiwetit.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/xaxuladudumevuwixu.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/panoturi.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1ddc25e1a---52479554336.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/34672060372.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/4fc95ca57ce415078f44e99e2cb5a0f4/gonemejoxenujagovogumuzis.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/guwumezuzakogakujinoledaz.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/wewoduworuzufaj.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/af73b2fc427c6bb4ba8be78b04ab56bc/4411062470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+cheat+in+mobile+legendPDF 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_off0000f1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EB 10764 bytes
SHA-256: 97048706422cf2907e2cf32ef9ba5c905730882c790d0082705a9815d33f85ef
font_01_sfnt_off00010a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3C 17056 bytes
SHA-256: 232e531514fe4e2a83d66ce182b05f3acc59e329f8414cf95f2f616125c6f5f2
font_02_sfnt_off000136ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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