Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02b4b618debe88b…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 11:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4c2d51d22e807a123fd1529461e522d2 SHA-1: 611b9906b772eab2b81ec4fcf44631cca3645c17 SHA-256: a02b4b618debe88bdd60fd82726d1f1f439fbc09944625782cbc2271b4d1c91e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a download button lure further supports the phishing or malware distribution objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=mini+militia+best+mod PDF link annotation
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/dapene.pdfIn PDF document text
    • http://vaithun.net/upload/files/87607798531.pdfIn PDF document text
    • http://rs-entp.com/upload/file/vonogaguwo.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/fdc0a803ef255449074b36337c2c17fd/dewibebomakesux.pdfIn PDF document text
    • http://contextuae.com/resimler/files/50996725700.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/jewogobolorutoziboka.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/35949836203.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/fexejagetufavazu.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/64803152181.pdfIn PDF document text
    • https://baptistfriends.org/media/porukutupodim.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/vaxidizatajebe.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/30291602699.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/zuladen.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/43553957986.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/17667548486.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/70632035102.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/fafif.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f13ccf2d30---dorajevinise.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b091971f7b4d1e15f15dd9ba6bfd9dbd/42040424737.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/49149899725.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/bejudulumefirufesobizo.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/piled.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/nejefanojunijiwimu.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210909052702199.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/mafixuverigorofob.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_off0000de9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9E 17712 bytes
SHA-256: 9ce0a3593fe495316e16a6d55c16778e3048fffb6c5dba16322dc21ed7d8cbe9
font_01_sfnt_off00010c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12476 10444 bytes
SHA-256: 7ece67604fac116ffedd1f74921a328a2f30547343d468af9e49dc6fbb3a8df5

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