Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b25ed5ceca4c676…

MALICIOUS

PDF

84.0 KB Created: 2021-07-03 20:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4be0521337cff7d11dd26d7804d9a484 SHA-1: 98640d18906239e5f0bee61f38a4273951827b0c SHA-256: 4b25ed5ceca4c67613411e6e3764e11209320f2b68bd85795e2308fc11c01919
204 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external links, including one identified as an algorithmically-generated URL hosted on a compromised WordPress site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to facilitate phishing or download secondary payloads. The embedded JavaScript is a key indicator of the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://grandplaza.bg/uploads/assets/file/napotukufak.pdf In PDF document text
    • https://mimpishiosatu.com/contents//files/10836644178.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/62003236976.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/35481991694.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2085df4a9---59248631017.pdfIn PDF document text
    • http://ellerbeefamilyreunion.com/clients/874543/File/depezep.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/rutomejifijizaf.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/97925848044.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/246905405608951aaa6064.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/peratatovejub.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/losaxubibonejemaj.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/gasikuxeki.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/lisejegi.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/7860121512.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/56250322360.pdfIn PDF document text
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/fq869rf08sp0ljm5g7rlsfs88h/pilagatuxatit.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/i8o4n75r8klpmu61keuqukpl27/levobabotezadim.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/pifaxisox.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbb437bd43---suxubosudolukij.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb6a47c08d---23657981947.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/voxoxovowitowipukarav.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/67386609812.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/vodusivilivesonukexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=hexxit+keep+inventoryPDF 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_off0000e532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE532 18632 bytes
SHA-256: dcada7167da332261b14283066870d605b22fc61ffc68c194822802c7c0b0ff8
font_01_sfnt_off0001139e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB5 10236 bytes
SHA-256: dc5aae04254c1f64da90315768ddfcfdb454535ba2be43bf4e99e444b2f6d3d6

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