Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43d9dc8e17d997f…

MALICIOUS

PDF

74.7 KB Created: 2021-09-18 14:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d343e238a6f582f70a3ec4707e5fee46 SHA-1: d57895dfafd6e7ea800fa66677b67d5cd72cc79f SHA-256: e43d9dc8e17d997f6d7ed841280f4356586840b9ae7f550674f80acf271c6d27
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with multiple URLs pointing to compromised CMS uploads and disposable hosting, aiming to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://gamma-electronics-eg.com/userfiles/files/53365821905.pdf In PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/tecrqap3vhgc8aipf3dpsi7epv/moxenuzuvurebisavepu.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/40918668840.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/melibakobariwerosarem.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130fcd1e85a9---zijinavijitowuwaxu.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/zabejijesuwazesogurejif.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/muzazamirodememev.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a2c82b593---guwiliginonividotexozal.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/35836660280.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/pewaneb.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-18-08-35-39-67.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/dedowaw.pdfIn PDF document text
    • https://ccskin.com/geektic/files/xofufotitotegimujibenoxos.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/bofalufeviwuv.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/58519862788.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/91249331925.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/zimikarexibomalumexudup.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210904_70F6D396F65288EA.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/32153059073.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/wijurikexuvex.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/11212797679.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/dubagezitejimuw.pdfIn PDF document text
    • https://wrd13.com/force/file/jever.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/9382119759.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/kuridixarafapedof.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/99574949085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=camera%2B+app+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_off0000c0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E0 17668 bytes
SHA-256: f01b474f59216dba2a3b2e2db429c1d7769fc691deaf9d310f089de06f18e510
font_01_sfnt_off0000ee92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A9 10272 bytes
SHA-256: 9df774d3584e4be6b005ece4a86686cdaffd0381dec7a3aef4d73e040cc75e96

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