Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c3e5544b7f6eac2…

MALICIOUS

PDF

85.2 KB Created: 2021-09-01 07:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 35ff59308f483caef4166439c88bdaab SHA-1: 964402509cab62d469a6a6978f1612fd71b7c73d SHA-256: 5c3e5544b7f6eac2dea7f72d7d338d90c2ee2f6696cf01136ef76f0e92345086
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The primary heuristic indicates a PDF link to an algorithmically-generated URL, suggesting an attempt to obscure the final malicious destination. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/9c3872f0eae1ca071bf48729de9168d5/bimigev.pdf In PDF document text
    • https://appfacile.it/file/gadikapidorojowuva.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/fq6mtjfgsoioov0kt0ssga8hqg/fadutelowujukixali.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/slknvlqetrl09kgc5sabn3diff/28336642050.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/gakulevebemomopatuv.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3afd788ac8---tumuwifoduj.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d346ba09cf---mevedonavefale.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ao264gv10ml2dkm168qjnvrrh6/21371049553.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/ep6ht4c8uhftfd6ncacvhfglo5/3544379928.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/fb67491c12092335c69d1a9fd23e44bf/35497068867.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/19998456608.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/vomotalenefojup.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/kebewowijalati.pdfIn PDF document text
    • https://studiorampinelli.com/file/bivuzufuzuvufogerivunalag.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/5mr6rtofsij2lm9pd18hl3tsv3/kononesuvikebumunusedu.pdfIn PDF document text
    • http://contelex.it/userfiles/files/72108285895.pdfIn PDF document text
    • https://andana.us/files/files/zegowobuzasibisop.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/wixarimoxiwazotul.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/50560968162.pdfIn PDF document text
    • https://pisangmanis.com/contents//files/31029031143.pdfIn PDF document text
    • http://domosplast.hu/files/file/xifonekidufakuve.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/aciuecf2ajlrorqg0ppj7p98no/57062019459.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0166f43770---69925109326.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16119a77643481---37002269494.pdfIn PDF document text
    • http://dzbnf.com/upload/file///tezojiretot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=shakespeare+autobiography+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_off0000e725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE725 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3C 11148 bytes
SHA-256: 2936a6ce4277578ffc2ac9e1a0e3ca017e92de80e724b9fc505edccacb6ef865
font_02_sfnt_off0001190b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190B 17304 bytes
SHA-256: 21dad8bbfd5b0adbc37fc08bd343fe3c2df2a473c5db5f4cf9a13d98f30d9b48

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