Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6b046c1ff5eef0…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 09:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d377100d779e09a2427e9c3ceb561946 SHA-1: 7748a25b0b6250f16922f6189bc7b9c7af1d5893 SHA-256: af6b046c1ff5eef0cc983bef612f445bd2eab2ffe98e9bd03edaade82ac49611
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting a phishing or malware distribution attempt. The 'SE_INVOICE_LURE' heuristic further supports the idea that the document is designed to trick users into clicking these links. While no scripts were explicitly extracted, the presence of numerous external links and the ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://autonoleggioassereto.com/file/98997727611.pdf In PDF document text
    • http://hermandadperdon.es/userfiles/file/pobugatiguluzoxizepi.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210903092924118.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/vimizonemazudexedukarit.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/16338220211.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/87877600164.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/fomutewobuzus.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/50122134972.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/4ce00ff4820f655da4a714031a497479/molevomonanagar.pdfIn PDF document text
    • http://indemo.pl/Image/files/menopuzefinasimoji.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/vosaxagisobaruvanagubine.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb1d287cd3---julimirisurojazuvi.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/pavupemesemezudurujavetad.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/jazemugujunetivuv.pdfIn PDF document text
    • http://com123.vn/uploads/file/rirekezewuturubopozunazig.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/bejuze.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/73929004185.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/perakadijit.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/oo6p4v5m71g29lqffodvov8dp1/98310909157.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/pemibonepew.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/mesabukefadafewi.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137bee29b5e5---katuliwexedi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=hours+calculator+app+for+androidPDF 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_off0000d6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDF 17948 bytes
SHA-256: 1e0acc32a29377ae651fe539e35d878a519835d012ffea56d05cbb352e6d22b5
font_02_sfnt_off00011cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF6 10572 bytes
SHA-256: f3c117ee4cb8be804b772d10a5c2f31f6a810b2c627ed252560a5df78ce4190a

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