Malicious PDF — malware analysis report

Static analysis result for SHA-256 a264e618688c8407…

MALICIOUS

PDF

86.8 KB Created: 2021-09-06 13:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9973337345a95df35f64b59a264e5b9b SHA-1: 6ca686ea57557bd5b6e44f9de62f679426f8c023 SHA-256: a264e618688c840732afcd658b11cef2fdecced60c8849750dfc548de6f0064c
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a likely attempt to redirect users to malicious content. The presence of these links suggests a phishing or malware distribution scheme, potentially leveraging a PDF exploit or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b290bc39bab---rupurakiwekovofog.pdf In PDF document text
    • http://brenno-tojestto.pl/userfiles/file/dabiseleweruxodagokudidoz.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/5ibt7hr9d7hthiav3a8omhu4b2/48219025445.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c724c9b706d---57445353550.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608259893bd7f---43655567661.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/merisofizo.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/rejazutidizutuluzare.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/22781326345.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c798b058d0---15282062387.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/33988371912.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/884abc692e10096abd1c6967b1c4664c/dotovozesaje.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/gexegazam.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kinosefenasodapexuwudabuj.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d65d87186---lebepuxov.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/jidizomevumetivotaguw.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/jasofebexigemedulu.pdfPDF link annotation
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/2a858176b7f6c9ddbca0a6fb7c30c509/zuwifikivifonavakisizel.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/puxosasuzasitelozezipul.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/jovusalinepapugafubeg.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/d79crujfk42vhhbc1jrfr7op54/18055759741.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/katimakibipuzufitisijom.pdfIn PDF document text
    • http://zubrcup.by/files/files/12396378045.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/89568086140.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/zamefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=voleibol+sentado+reglas+pdfPDF 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_off0000edf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF2 10780 bytes
SHA-256: f1260782cbd4dc7ab0a6990610673bf9d02b7f4b39e8e3beabbdf171ed7c3d0e
font_01_sfnt_off0001067a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8C 18572 bytes
SHA-256: 1bd79a154142267b40bcac75c57b40f3239e6a83f342ca47258c69aefef8db50

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