Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb0e4e5e06e88a2…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 06:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 80a521d2c78b1764c4b1db916427a594 SHA-1: e6c3e3fea7b8f2df487a01b8612ee840812bbbb9 SHA-256: bfb0e4e5e06e88a25c3b3d646e199a4c775d1898f174336e06931f82d3f8ff1d
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm pointing to compromised upload storage and disposable hosting, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. The embedded JavaScript likely facilitates the download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://erainbowrealty.com/userfiles/file/22179416797.pdf In PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/2131a4999b221a2dbe9faefae2617c76/50559259285.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/97734292808.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109030328055534.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/xewepakil.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/22361136499.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/xexewuresi.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/bitasepox.pdfIn PDF document text
    • https://serka.com/serka/upload/files/litadazibuzasunoki.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16135c08de76c8---wafureletotujodi.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/fekodezolezusuvuli.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/xazitekiviv.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/jemegipegezuxibaw.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/bikaronevozijowejekomini.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161396ffacc645---wemojeforekaligupidi.pdfIn PDF document text
    • http://glassick.com/userfiles/file/lavogetipago.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/gabirisupojigi.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/61089360403.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/6785489419.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/pezozowosetoberejosoxu.pdfIn PDF document text
    • http://kodemari.info/data/files/fujokuvalekopopabegepid.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/xijuxinekoxujivusowepewod.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/34303539859.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/donozudinegit.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/ripizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=java+edition+apk+downloadPDF 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_off0000d817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD817 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF029 18488 bytes
SHA-256: 19fb754eeeb45afc1789922144ec01fc0f35b0379408d79e38c2871f57237240
font_02_sfnt_off00011fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC3 10352 bytes
SHA-256: 6a066c98bd10ffc32e3388c60984c821ea66d09f9d3a516674ffa86fb933dcd9

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