Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d19c8afdbdbd92…

MALICIOUS

PDF

74.2 KB Created: 2021-08-27 04:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4b89738fe3611ff43050ee5d279073b2 SHA-1: 901bd46f446923abbaf00d15576216f7dcc5d5ee SHA-256: a8d19c8afdbdbd920794cdd94ef7686eaf4046f1a2737876f30c1729c573b896
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the PDF_RANDOM_URL_LINK heuristic further support this. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://grupahatak.pl/admin/_fck_files/file/zonizevug.pdf In PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f754eabdd1---lijigoxakedepixosesi.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/62090601602.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16092db1a624e4---9225930439.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210516/2105160533492950483gfyayxjgi0r.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/ou1k4v0igetjv9an1kcgbgn8ie/xilimagofu.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/zubidawido.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/0475e0c28799dcad78f5c9a3aec8866f/26336852594.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/58741853771.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/5abbb13c85b8f6abae13f7201bfb4d72/barezegoxaziw.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/bufobomabipidaripitapo.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/cesvoje3uaam3hbdvoc7rv5uub/xeboxevovi.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/1d24bb785b6556ad93b8bca1c2d746a8/70089531315.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/84516145903.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/75187794350.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8538fd7589---73945593810.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/920338031.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa59871eb53---mexux.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f3eacd05496---fitavasewavowirebusufenu.pdfIn PDF document text
    • https://people11people.gr/uploads/File/71375367048.pdfIn PDF document text
    • http://hzdshg.com/images/upload/File/61984193134.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/f621ab77359ab943784007469aec7a69/xerupazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=set+for+life+draw+1892PDF 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_off0000c019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC019 10784 bytes
SHA-256: 91799f22e1a4b2ad2664bd14ea0f799f6505f21033e3b896f4a44541f4c33bf3
font_01_sfnt_off0000d93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93F 16124 bytes
SHA-256: 321275eac15cd57360d15a85f733f158200f9707f2899d9ccfbb0650887c28d4
font_02_sfnt_off0001031d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.