Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6771376b33d97f7…

MALICIOUS

PDF

100.9 KB Created: 2021-09-20 12:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a4041698d570d6274d73a79adb6e8e58 SHA-1: 198e62e06e7bbfd11dd5583877d4d686b1aaeb07 SHA-256: d6771376b33d97f7a6eb39719a2cfcced719cf3903610f469acf5d1a33cd955b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. Heuristics indicate embedded JavaScript and a link farm pointing to compromised CMS uploads, suggesting an attempt to host or redirect to malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://medvor.ru/uplcv?utm_term=youtube+to+mp3+downloader+pro+apk PDF link annotation
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e736b49f2---segaji.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/14580615140.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/fifazetuk.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/97757585765.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/xenesulakitiz.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/67375998480.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/71454510293.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/85687771185.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/netijaxugafom.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/mavetalulalubinuzu.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/93994809237.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/suwodefanubizozugimulanur.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/7737689172.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7fdbb19b1---93127626650.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210907_97719731A64B637C.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/31221689204.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/ruvoj.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135c9aee152d---63324443085.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/tuzefimovowonedesiwuzale.pdfIn PDF document text
    • http://live-net.it/file/81365855063.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/41892324457.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/98872872276.pdfIn PDF document text
    • http://stisk.com/file/16481387508.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/lemonipizuzegunapile.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_off000121f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0A 19576 bytes
SHA-256: 90149bd655dea8842f80f7ef805166409c1869d53c054a7af6417852d16ab718
font_02_sfnt_off00016d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D37 10868 bytes
SHA-256: 2fa640237f824f2428228a0b7130d74013506d8fa4aff81f8365406672cc8500

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