Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c4583f3d46488c…

MALICIOUS

PDF

86.5 KB Created: 2021-08-01 01:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0ce6fddde194477f689ec5c81c0defde SHA-1: afb9c5548ae3e5564f27e8d3b5d1eca3b091548d SHA-256: e5c4583f3d46488cd8177fb1f01c6a58fc5f22840a1c528ec03438f8439375e7
196 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous links, many of which point to compromised WordPress sites. These links are likely intended to host and distribute further malicious payloads, as indicated by the 'PDF_RANDOM_URL_LINK' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ClamAV detection and ML classifier also strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • 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://veterinariacomportamentale.it/userfiles/files/92278102061.pdf In PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc89197bc5f---madamojisixixavumujumon.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/malonepipikokamilix.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/rarataxok.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16078ed114ba8e---67970071658.pdfIn PDF document text
    • https://makenie.com/upload/files/28747179276.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/f505f25la8q09uma9a2rlviniq/39300346163.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc4fb9f253---nefatupefawuzerowa.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a591e1ab872---gizamonokapipisidizofuzo.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/nuxewigupajopesoraseg.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a253e1f8e---30233377482.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/3497650434.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf24e05242---sirolosorixezufutifowofo.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/zugukejopuzegiwosika.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa20a87a6c---94000238538.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/mirofaporilap.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd83a4d6c6---39398730541.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/zusolefusifute.pdfIn PDF document text
    • http://capital96.com/userfiles/file/lidava.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee49cc0328---zebiwejofavivemejo.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ldaf8q1iqpv45o1qn2ft3a7ki2/gugosezazoviwukuduxepigo.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/mimaberusoxonamotuz.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/felulekofoxedezuked.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=what+are+ancient+egyptian+symbols+calledPDF 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_off0000eeb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB7 17108 bytes
SHA-256: f136c7d1141d38d90d7ffe04a7cc9193ac1c1e5006299eb8cf80acf34d6a2a8d
font_01_sfnt_off00011b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9C 11208 bytes
SHA-256: bc37d27eb9ab5af5220a1801332af46201815cee932e50b884614521c6f20245
font_02_sfnt_off0001353d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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