Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a1ec733b08e315…

MALICIOUS

PDF

86.8 KB Created: 2021-09-13 13:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 056b6b969f34156ac6f43972ebc29414 SHA-1: 10ef642cce70be35dd8934b03481618d303bf415 SHA-256: 18a1ec733b08e315f64df82b9a2f8d64f5c47916c846b7d10e1c4d0768309736
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score further support its malicious nature. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall pattern indicates an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=download+google+play+music+to+computer PDF link annotation
    • http://carzip.biz/files/uploads/files/86462303164.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/gf90etc983fao22vb14ml3jjfb/18233480102.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/lijin.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/88052612864.pdfIn PDF document text
    • http://khlongtoei-nfe.com/library/userfiles/file/filavi.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/76750681675.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efed77e700---52242422526.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/91750934072.pdfIn PDF document text
    • https://rubfila.in/files/file/53122765122.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/29627199904.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/bevegipukezureturasokuk.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/92898834671.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/61192053980.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/57164825335.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/e83df1370ab2db666fe4ac9f3681594c/kigipazida.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/54438597459.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/45722079233.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/popewefegikusake.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/nazodalebax.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3e3f64748---ferato.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/13906128220.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16131873ddc8be---74866103444.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/lopamuverozox.pdfIn PDF document text
    • http://lobi.md/userfiles/file/70800248043.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/piwajasifojobiduteg.pdfIn PDF document text
    • 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_off0000ed40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10557 11160 bytes
SHA-256: 5d97a516d7f10d5ec72e1d46580d2680cfe8c18a1e9b3fc94368931c8e92c42e
font_02_sfnt_off00011f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3F 18040 bytes
SHA-256: 066b3b09a008d6c4a99a5fcbd6c89e0a02b48498deb48e26eb471c86d35eea1c

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