Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da245c459180fa6…

MALICIOUS

PDF

77.4 KB Created: 2021-09-10 21:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7fbd543dd8633a61ec7035a7a69448c5 SHA-1: ed081f09e33fc5661a2eed6e22baef0035eead67 SHA-256: 7da245c459180fa6d7f8077a134e91f9204bb59be835f4499fc8f2a2fd92d061
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, some of which are hosted on compromised CMS uploads. The presence of external URIs and link farms suggests an attempt to redirect users to malicious sites for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://www.aukuras.org/ckfinder/userfiles/files/jabomap.pdf In PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/fanuvumizekonobusonox.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/10989784314.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613161a3245f4---62104621009.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef926c203f---gojig.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/6132ff36551ba.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/disuni.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/55789696844.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/16472543727.pdfIn PDF document text
    • https://ms02bet.com/contents/files/dixor.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/80942926841.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/wogof.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/76873131494.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109021556272709.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/xekotago.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/69826726739.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/tojagamiz.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/tejowabovotuseditejebu.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210906_034613.pdfIn PDF document text
    • https://ysh.my/userfiles/file/nimirimerarimomeze.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/44990489960.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/78000236924.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/pudemanirixovepapukowab.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/jowadowovupijupis.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fed63f066e---90782369765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=use+robux+gift+cardPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/zutagukifusojinuw.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_off0000c8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C2 10848 bytes
SHA-256: e03adecdeb31ebb02c554294e37269181b7fc2fabf7d6d7c31de57cb815cef6a
font_01_sfnt_off0000e1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C8 17632 bytes
SHA-256: d13926bd5d5de917e8e71283859f2b60ce5c7aa8036c1a631e5f63dbb098829d
font_02_sfnt_off00010fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1