Malicious PDF — malware analysis report

Static analysis result for SHA-256 f520e658bc095fb8…

MALICIOUS

PDF

69.5 KB Created: 2021-09-27 15:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8da9dd7ac49efd6e5444b4fc48bf118e SHA-1: f8a2225b3f580daa694af30e103c3a5220c7ef2f SHA-256: f520e658bc095fb8d1e828bddbf5353202dbc2ea4d851f04f187907cd58d2938
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as a phishing lure due to its image-only nature and the presence of numerous external links. The document body is heavily obfuscated, but the heuristics indicate it functions as a link farm, directing users to other PDFs hosted on compromised websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to facilitate further phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcca20f0de---5501962113.pdf In PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/mubetapegenuzig.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/47371655154.pdfIn PDF document text
    • http://kammed.com/userfiles/file/jagujowofawuveg.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614468357c504---wibupunakuminozok.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/ponukedekogosawufip.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/17173252068.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///16074158222.pdfIn PDF document text
    • http://domosplast.hu/files/file/dosigapuvefulexoxarorobi.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/50204033890.pdfIn PDF document text
    • https://kham.vn/userfiles/file/sogabagesowesoxizibo.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/81983968416.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/32210217504.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/dibulapapimokib.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/xasevif.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kaxaj.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/019978ee028ee56972a7beee5362f747/jubipoma.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/pikerubemapow.pdfIn PDF document text
    • http://archbot.pl/files/file/32471755455.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/sisobilavunorelavar.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109032253352096.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/nowaxetan.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fc34e6e799---68919656524.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/zifasoruzefinekedoxuvixe.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/7757208257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=boruto+199+streamingPDF 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_off0000b1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A7 14308 bytes
SHA-256: 5176ae143c3ede6707f78b8d44d6463f5b0ede94b422d21a61e6bdcb4b5d6c1d
font_01_sfnt_off0000d54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 10780 bytes
SHA-256: 3e6a00048d54122223253831d0579716efa8d6fdf54e3d0f926c6961c723ed9b

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