Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eff79a73d0905a8…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 04:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2daf710ceb2d54664575976e1e0e2ddf SHA-1: 7dbd4da7f8c70f16bc6a86172bee1edc60bd5128 SHA-256: 7eff79a73d0905a8b313bd69a8ea875e0e6d45d0dceb96286c0a1040ece28e3b
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and multiple external links, many of which point to compromised CMS uploads or disposable hosting. The presence of a 'password-protected archive handoff' heuristic suggests the document is intended to trick the user into downloading and decrypting a payload. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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://ketchas.ru/uplcv?utm_term=pixel+cup+soccer+2017+apk PDF link annotation
    • https://rpdev.org/ckfinder/userfiles/files/60809471939.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce0b3b5668---63386007991.pdfIn PDF document text
    • http://innotack.com/userfiles/file/dajakosek.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/jefamizijawi.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/37474801059.pdfIn PDF document text
    • http://erex.hu/upload/file/58755416872.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/midovurolawixovakuzevuf.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/disaxivukipobotefum.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7dbad8cdb---57501003813.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/354588655.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/45633158868.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/2pk866f52qduiniiukcf4lr8i6/32779835605.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/famumunataxibegotewexuf.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/xibuz.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/gaseduvi.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/xixorijevoneboloki.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/84573843395.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614289aa38f57---73755408098.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202198138349902.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/5813640444.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161404925b3648---64022328535.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/fonabejefojizopiwa.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/daratelofosezabelasuf.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/mivimufaxumemakeboz.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_off0000e56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56F 17804 bytes
SHA-256: e11e98201eebc59f844a76392655f098dfb486ce4a7514a4cf419095a26d603f
font_01_sfnt_off00011304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1B 10804 bytes
SHA-256: 28b088d95ab9158a9f03f46f47032e8f75d357764dfa12e9ee28667d7c53006b

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