Malicious PDF — malware analysis report

Static analysis result for SHA-256 8acfb68851b54af4…

MALICIOUS

PDF

76.7 KB Created: 2021-10-02 19:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e62134fd675b90e1d7f53ed9a9551206 SHA-1: 2d73d37d9635b2d016226f1c41d2fd965cd03523 SHA-256: 8acfb68851b54af42972323808f7bfc9f1f9929644d49dbfc1978d8925b0f3b4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a link farm on disposable hosting and compromised CMS uploads further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://irlanc.ru/uplcv?utm_term=hey+there+dej+loaf+mp3+download PDF link annotation
    • http://gradn.ru/uploades/fckeditorfile/kejupejok.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/84871798111.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/56762259549.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/12fd733940437d5262fdbd584d0173d8/98018783507.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/punalumamebepitop.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/d4a54e244d0ec603ac21323d06764e95/sagoxukivujepiwafewop.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/48408051502.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/68380630179.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/939480783.pdfIn PDF document text
    • https://tipresentoio.it/images/file/gizefapitizovokafizom.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/nisebotabuv.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16156fd59a4fbd---32228807503.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/supipelewolamudoxaxotilup.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/65724753947.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/rulipuzugemutab.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/jonedunabikukejumuvaw.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/46553201014.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130fcd1e85a9---zijinavijitowuwaxu.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210906195624_72ux93.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/porimom.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631963573.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/bugutejebabezubegekisi.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/jomutafelibej.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/e267bd7505a1169d54acae029b7cf2d3/90726596088.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_off0000be4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE4A 10996 bytes
SHA-256: c0562502e20f71f21ed30f18c74f711aa4e25b3d85e523a2250f93872120e56d
font_01_sfnt_off0000d7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BB 20832 bytes
SHA-256: e9d3ef6a54c22a3fd77c83bbb32ec0eac7b4eb4d174927b1d8898e6c46056052
font_02_sfnt_off00010d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1