Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25abb9e0eda8ad2…

MALICIOUS

PDF

88.8 KB Created: 2021-09-01 17:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2d9cb44c7c9d6b83f425384d236a2ada SHA-1: ef67fe70f8bf48134769a555669a1c578fe7bc75 SHA-256: d25abb9e0eda8ad2315ddb9691ba9879bdc988e2fdd5d591986cdae61eae87a6
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URIs and a raw IP address further supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://a-pluset.com/userfiles/sikezekapedunakutu.pdf In PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10636132119.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/satag.pdfIn PDF document text
    • https://bor-diing.com/upload/files/tasekizopabesa.pdfIn PDF document text
    • http://dothi.info/images/files/popejikerisuwinojilid.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/75381224841.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a912ea0cf1e---50218216648.pdfPDF link annotation
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160865f57135b5---6496117288.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/28294432032.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/i26rrua75teqd41hm3jv6vuaol/75233805889.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/niwataka.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/51147606895.pdfIn PDF document text
    • http://umhouses.com/uploads/files/pekogepewajixelapituke.pdfIn PDF document text
    • http://heizler.hu/files/file/xafoxuwolawasakegu.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/jurexonixivexigo.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/10176437525.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/6p8ft17aegv97pjlo2lbis7ek3/tabijinapapujixumovawu.pdfIn PDF document text
    • http://servmed.net/userfiles/file/gorevojurikilemumadus.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c13ec9aea17---67424494970.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608942d4b1539---xomipojugenemikawazaf.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082f0cf7bdd1---jalopipuguluzukuli.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4464045a60---4559694302.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/53801238246.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=convert+ppt+to+pdf+free+onlinePDF 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_off0000f8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E1 17440 bytes
SHA-256: e7093271ba7636f385abe6a29850136677ce801455af6daf3733858e8c70856f
font_01_sfnt_off000125d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D1 10260 bytes
SHA-256: 0ab5a47dfa689818e4a52ca55af9b2cf19b5df769bab5b628dc2721106017822
font_02_sfnt_off00013cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1