Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9f239e76f58ebc…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 02:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 51bc6d76fb12408f9d3ae29aa2a3f683 SHA-1: 9949a94b9e084fc40924fb66878c2ca8139f75d7 SHA-256: 5b9f239e76f58ebcd51d21069281d1a0595afaeadfb6b5864773936d0a7a83e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or initiating redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • 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.
  • 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://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1613c602b73a75---30871535827.pdf In PDF document text
    • http://ilturismoinitalia.it/userfiles/files/gomepesefa.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/lebabajeju.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/330655861.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210919_10D25D94014701ED.pdfIn PDF document text
    • http://0228339500.kad.tw/kads/ckfinder/userfiles/files/76165555461.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/wexafuwuxasajekifobeja.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/2cc47f1a203ef356883dc18e89b204a3/dogedixegom.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139c09f4dc9a---rogawowup.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/munesedolixosutedaxutogi.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161392b46b5ddb---vemonuwomu.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613046f1c9a93---bemawufemopu.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/nipisevewupovunopofi.pdfIn PDF document text
    • http://dobosugyvedkecskemet.hu/userfiles/file/kuripinetusuvulamazunufil.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/988386236132e7bfb0f70.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/23974434280.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/24251909427.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/xavakipugavudosobenexap.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5feb058408897abe872eb82230830c87/32230238136.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/33197477149.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/37735286239.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/22981780147.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/35973215527.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/5158173956.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210911_060359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=android+app+backend+languagePDF 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_off0000b060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB060 15252 bytes
SHA-256: 444bde4e963e0001479d6007c350509e84792ef6eb8a2c4e6409337d628c21eb
font_01_sfnt_off0000d6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A4 10736 bytes
SHA-256: d9c1457e7e8cd5026d83ac397bde645145e6e88fb9540efc5765dcb07adea1dc
font_02_sfnt_off0000eeee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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