Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e5c4a88e83a071…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 17:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 742e0e0c54501b74ff9b0e0d00ce8f33 SHA-1: c00df6b32e82f6aecbe10b69195f025ebf3fc391 SHA-256: d8e5c4a88e83a071ddf3314df286b16959c3df68840cd2f462def23554535c67
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to compromised WordPress installations and disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://domusanna.it/userfiles/files/91345978654.pdf In PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/752fcb22b6d97acd8867336b3fff8482/5038044510.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/50386986812.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832bf0b22fa---lumajabetoduruziruxazawab.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075b87253c20---panomuzejavovizapi.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/genotudojikerubezejodepes.pdfIn PDF document text
    • https://umartravel.com/files/gorimirusumalibekaru.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/23711628392.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/43048297085.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/63621774442.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/nutevazuxuwilibapikofilun.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/16312463213.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/eb40b8eea9a372111eedbda56759e343/48796665287.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/xidawuluwurisasosanosogo.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/95494714588.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092045f215d0---mapefitewipogokepafogal.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d068e20a38---libokagavatisef.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/10844230726099b87a9ccfc.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/tuxip.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/wemufarapubovupaw.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/49063046235.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/kuvovax.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f63a04829b5---gojixivulurumiwakub.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/muvewo.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c23b918288f---kojigeboxotojolifus.pdfIn PDF document text
    • http://donghotam.com/luutru/files/kuvalolodufobanuxudatoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=soal+dan+pembahasan+kombinasi+dan+permutasi+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_off0000d666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD666 16816 bytes
SHA-256: 3662ebed043248445f391e9e43331d09f1fdc7205fb54da0ebf35196fc07aa29
font_01_sfnt_off0001024f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024F 11172 bytes
SHA-256: 3e10e2b0a41e2710720a2701236e392e3af8147017aa60cbebee39c59831719e
font_02_sfnt_off00011bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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