Malicious PDF — malware analysis report

Static analysis result for SHA-256 216a1e83c1efc62a…

MALICIOUS

PDF

67.7 KB Created: 2021-09-17 21:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06c1bdd8338e5e44b6ef150ef8a6a094 SHA-1: cd7564359438e4edc5b13f17d977f613dad62294 SHA-256: 216a1e83c1efc62a51be749b47c4ed339e944dcc136f828e23a558becef877ac
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a link farm pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting, suggesting an attempt to distribute or redirect to malicious content. The PDF's structure and heuristics indicate it's designed to trick users into clicking external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 0 text block(s), carries a click-outward action, and is only 67 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 https://underworldgear.com/upload/users/files/zuzuvosedas.pdf In PDF document text
    • http://kccmaul.com/files/files/81365103672.pdfIn PDF document text
    • http://benly-carson.com/product/files/25152961442.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109101559035914.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210908193000.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a31095c12---jexesagowomimozoxub.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/86504472832.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/finivapalebomidelekuj.pdfIn PDF document text
    • http://lamay.de/userfiles/file/repiragapajivuzunabife.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/72394150114.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/75690772460.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/dokeguxumorewotep.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/kotabagizi.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/puxeragupaj.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/89939890145.pdfIn PDF document text
    • http://yuli-china.ru/d/files/gezejozobaditerexopa.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/86403283640.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/75648052607.pdfIn PDF document text
    • http://hangquangauto.com/files/kikaze.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ahud5vrampcop55cg9glsscht0/88673690178.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-18/20210918003434626352.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/6992537451.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b9a22fa8a---80643656330.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/wobewotononatoxab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=among+us+free+gameplayPDF 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_off0000af20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC737 10708 bytes
SHA-256: c7be0896f381873d20c1f689a32dc7681c8d95d67fae051ac553b2711f9b2aa6
font_02_sfnt_off0000dfd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD4 13664 bytes
SHA-256: f7bd01812841e10fe65e6616b25ca6e4abdaf7d4dc6c7c13c3e5c3f589155157

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