Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0a9fc5ed1f4db3…

MALICIOUS

PDF

101.5 KB Created: 2021-06-29 23:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d4856ca2516a2ceac8143e38e51094db SHA-1: 8f8f32b79f3627e4f7cbccc1a4a2d74fe919cbde SHA-256: da0a9fc5ed1f4db3f514380c1b41fa50a1efe32edf9882ec6339a7eeb471d105
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7237f99157---rulefafuvagepujedisam.pdf, are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • 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.
  • 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://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a0e3a5958d3---pupogivivefune.pdf In PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f5f280fa7---piwodipixa.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/gidinug.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/moxelironifum.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/gusamonewujagepokuvawet.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/97149815267.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7237f99157---rulefafuvagepujedisam.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/panixixamuxeved.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/badiduboximoviwebifep.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/uanskgtfqfvbah4l04hjap6hd3/fubipaf.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/79790301311.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080f90ebdde2---pogexekebumogalefisug.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b752eeed337---61137047008.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/3455396799.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/f9d0fea6a133adfae042a073f44cabc3/90222727937.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/5259292034.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021062409033773499.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/tawam.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907ebc84663---41107883324.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/fupixadopiponek.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/53260734266.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbbc2a9561---15562066479.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/29303953031.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/30d58ca1252a69964fdfc931cfe5e97d/nosob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=being+sick+meaningPDF 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_off00012ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE5 10356 bytes
SHA-256: 7bf1e9ab8714460b943126f6daf7f8922fcc3c4981cf2fb36ec1897edcdf45be
font_01_sfnt_off0001444b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1444B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C5D 17516 bytes
SHA-256: 205e44294d3caa53d783dede497d78c983674c45320cc8acd115e37e5f616fc1

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