Malicious PDF — malware analysis report

Static analysis result for SHA-256 01ac2659d51e4957…

MALICIOUS

PDF

75.6 KB Created: 2021-09-07 13:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 256eb8d3623b826cbf2fcb7415a0540c SHA-1: ee7014b9eceb07c5aad2d573126660e0331c66ee SHA-256: 01ac2659d51e4957716437dbd955c0e1f9c483ac25b6d70c1d96cc056fc42b87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's part of a phishing campaign, likely using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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 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://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf20fd4b40---67291696870.pdf In PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/edaae4502786b5d72001055955044f3a/zikaxiruniligo.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080407b6f240---zinupirofuboxusibi.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/42500988023.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/misosuzevune.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/1sjucubrr6vhplv9vdj3eo32pl/6953925704.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bnd2hjd75gqoh1jsivu0gg84k0/13980148116.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/61400587816.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/8btvojntb9ug078o9j88sj8lk6/51497185585.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/5850438160.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cfa77f0bd---91550789139.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b784727ee68---2886076347.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/zizozinekokojemiwaxelin.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/8385164662.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/gazarazoneg.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/83597119735.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/kanirixolanoxusi.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/1586354487.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719de91eb74---kofotideduligigujakapa.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/sebegusufigovemilironazo.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/bebasidabo.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/73086700995.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/56d70c27b95d23f228982bf0b83d1fcc/pakunebobezozojutor.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/44754412487.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/8e2e7208fa2d4e71841d1824c6c2d6d1/98184799630.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d31146e8d---tejovowuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ways+to+prevent+deforestation+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_off0000c77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77B 16024 bytes
SHA-256: 9c3281c0f1a3e37b43a49d7b2a48f097d5a1d9a75040da6e5f7b43b320918cf2
font_01_sfnt_off0000f06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10882 10620 bytes
SHA-256: b27f53c2a73231baec3207e81001a4f7ef4d1dbc4c7d4b903529289d7eaa3b93