Malicious PDF — malware analysis report

Static analysis result for SHA-256 dae5239872897cd9…

MALICIOUS

PDF

85.7 KB Created: 2021-09-14 02:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6898b411344542d8da561f09658ef05c SHA-1: 397cefadc61058e69ed9a2d87395d64afa4d3fd1 SHA-256: dae5239872897cd965fd2cf308348905fba60fc63ed046b07eae7d5bd74bd074
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URLs, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=iphone+editing+apps+for+android PDF link annotation
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/51907882668.pdfIn PDF document text
    • http://ingore.cn/upload/files/rateramimapusogi.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/62h23ami37ue5mobktcbuurpao/xijetu.pdfIn PDF document text
    • http://arsvet.ru/img/upload/99268698767.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/rolerikamir.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/33881862825.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/jovoxuxafenomimi.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/59073316672.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/71517520432.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/rusasebegekovebiworo.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a94ee4c4c7---zajiteragul.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/joditizofasomigap.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/xaruditoj.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/gidewapofulonesat.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1ffea321f212ebed7dc69a4dd1c9d5f3/rarutuzanuvojudapeki.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395da2e49aa---bipexuzegej.pdfIn PDF document text
    • http://dges.in/userfiles/file/58244990150.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/17919249987.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/71779179085.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/31596526637.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/kobegix.pdfIn PDF document text
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/69724113003.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/4338330241ad8bdfa85d0a24f3237469/63592831064.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/65167602586.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_off0000e980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10192 18296 bytes
SHA-256: d437bf52b8133df4598e2779f4fb9c9d64bd23472b5c595e3fea0f19ff01a0ac
font_02_sfnt_off0001310d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310D 10684 bytes
SHA-256: 671a9f140360f64001e9e731818e15116465b5016c525c87137f89a8f0dc37a7

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