Malicious PDF — malware analysis report

Static analysis result for SHA-256 a20f1b934285aa4d…

MALICIOUS

PDF

88.1 KB Created: 2021-09-11 17:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c151e29c134d84fc69bd5fc563baad2e SHA-1: 2b9d3c5abfecd03755200265a6113746882e1310 SHA-256: a20f1b934285aa4df2ff17c08020f5661fdb44f5d76fc0508949a1b33ae28d8f
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including a link farm hosted on disposable domains, suggesting an attempt to redirect the user to malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://irlanc.ru/uplcv?utm_term=terraria+mods+for+mobile PDF link annotation
    • http://www.siphonicflowmandiri.com/upload/files/kujamosoredux.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/29963712957.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/14053347832.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/lunabapodijujutonawajimu.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/duxero.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/rerube.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/18826301068.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/vojirafug.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/mubobuxubarezewepepelo.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/vip8a5kgrg8d0c834shmrk19uh/70403125303.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/rumuratexajonosoz.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/sefapuxiponowimodusiviki.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/duxafejorekafenog.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/pisoz.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/pisadilenofimi.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/menofomabesati.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/59780504332.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee257d9679---33447872986.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/43384422018.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/06b24ef50ebee9c365a301d2f97de2e9/gojesor.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/76156753438.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/22691943703.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_off0000f1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EE 19080 bytes
SHA-256: ac47d67c80e85fc621a22bcae09d01f5c2ae27e318bb8aafa8570376c85ea262
font_02_sfnt_off00013b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6F 10416 bytes
SHA-256: aaddbb49cd13925d818c40c5bc8dc61274e75bc2a3c9edec3630bdf65d7243ee

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