Malicious PDF — malware analysis report

Static analysis result for SHA-256 95fded540201993b…

MALICIOUS

PDF

70.5 KB Created: 2021-09-29 14:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 81fa760a8a7f868dc7f468732960561e SHA-1: 728312c7185daea7f9cb427404b346ef27ab532c SHA-256: 95fded540201993b984cad496a40f2bca4095d38b890dc6fdbed694598f8c176
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Analysis reveals it functions as a link farm, with numerous embedded URLs pointing to various websites. Several of these URLs are hosted on compromised CMS platforms, indicating a potential distribution or phishing campaign. The document body is unreadable, but the heuristics and URLs strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://laborke.ru/uplcv?utm_term=bloons+tower+defense+5+download+windows PDF link annotation
    • http://lnv-cnc.com/userfiles/file/98698109885.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1631898786.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109140158067692.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/16109468341.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/bununamadaxav.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/buribugenotopimiwimipame.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161506036aa861---dezomofamenulov.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/zimoraterajopa.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/08cdecd3730bd39ea476edebbe10aa72/rozofevi.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/096e3238c72bcc6e76c7d7ad3122a7c8/rekukupekivosara.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/zewagavozizikija.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/11872121248.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/saxini.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/1921837015.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/lijezapiwumiwoxomokozevi.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/bavufuxilojarizis.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/19719046443.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210920021856.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/hnbrb69d5ffn772b80c4aniku1/zalawuxutozifesage.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/f62c1b36baf807dac665dbb036b6e7b3/46178874983.pdfIn PDF document text
    • http://exim5.hu/_user/file/76610342597.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/48692677153.pdfIn PDF document text
    • http://domplus.su/userfiles/files/bidesozajesedisivunog.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/62066362281.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161428d0975628---ludom.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/mudeviwegigakigubo.pdfIn PDF document text
    • http://rococosofa.com/files/files/wusidazosul.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_off0000b327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB327 15972 bytes
SHA-256: 1b432868e136c7da5eb42218208ba484db43ac79c8c20ecb9833eebd110d1a63
font_01_sfnt_off0000db3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF352 10620 bytes
SHA-256: abba53266fbc1972f86f2837bf8ca255aa767a664334beb82db44ec20eaa854e

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