Malicious PDF — malware analysis report

Static analysis result for SHA-256 febd1a5990db142e…

MALICIOUS

PDF

85.9 KB Created: 2021-09-10 03:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4e3f3d7c9a0ec81701598e2a5c3e8ead SHA-1: c40f6200ed2591032132ac9d37d956a29a6ab970 SHA-256: febd1a5990db142e629d0f4b99c52fed0bce6620de0e8602c55fa62fd401096d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://ketchas.ru/uplcv?utm_term=basic+daydreams+on+android PDF link annotation
    • http://xinghui.co/upload/ckimg/files/202109100613469617.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/0kgjcqhtk67lev4h6nul7445t0/paketikuk.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/76211508482.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/sejokiwurovog.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/madit.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134fae5a9270---66843753849.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/faboxemifimunutefo.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/50249561787.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/34403313769.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/pujixuvagekefapupefuke.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/5778587004.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/53119548808.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/patudonewune.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/vufesos.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdc6dd3719---padikomib.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/129b92e3dc9451579aae08cc80720e82/70688779499.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0b13ddb1b---31387848690.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/sefuv.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/dalemekugereduzavuwofek.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/1d88131c08f6f69e2b1a9ae81a803202/40756013026.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/pejanipewavekakowe.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/molepulubobekun.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/13005721454.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/saredotam.pdfIn PDF document text
    • 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_off0000e867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE867 18628 bytes
SHA-256: c6b2385b48239ef0e95fc5c3dbfb055d3afa579d378b6111dde8f6ab8f263dc2
font_01_sfnt_off0001199f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199F 10556 bytes
SHA-256: 323f9a71e4f19d0e1516820d14af236ecaefc1a66ed5f045e3c2ec38d4def779
font_02_sfnt_off000131b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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