Malicious PDF — malware analysis report

Static analysis result for SHA-256 6daefca31c525eeb…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 01:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ee843e29b122e15fa03fe485ae006c60 SHA-1: 749f92c3dfa7d1ccabaf50a0e5fc50a862e738ba SHA-256: 6daefca31c525eeb83d905ba2e2ef89391ae7ea97b929ef4498938149cb1eab9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://birkhoffhi.com/userfiles/files/51827866160.pdf In PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161361176e0c2b---zilerujufivenilepopevig.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/32148373125.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/92258567be7c39cf4969c3663c19ba19/60873637021.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/kojenibikaxutujosavabaxer.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/fowonez.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/83980653486.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b4399feddf554b3e98014bac8f0fad11/setadasufujexok.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/narodode.pdfIn PDF document text
    • https://ntc-container.com/upload/files/tusebut.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/161460f7b39292---98483221442.pdfIn PDF document text
    • https://apluskleaning.com/admin/images/file/tiwotumugitufan.pdfIn PDF document text
    • http://szcftz.com/upload/bapoved.pdfIn PDF document text
    • https://ahha.az/userfiles/file/87770943140.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/96852781095.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/66277154724.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/32764902367.pdfIn PDF document text
    • https://wonkingchina.com/d/files/watulajomijazovufidubi.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/xepapazuxamovo.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/90673796124.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/perivugudadomofuva.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/96748263474.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/wopekuxemuxu.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/45239622202.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/66165096127.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/titejilakanivufejeli.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/96588926899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=andrax+penetration+testing+on+androidPDF 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_off0000b3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F4 14588 bytes
SHA-256: ca58c41ace7fbe0a85a782a5e6f9cca9dd925f3ae053c9254d97c1fff0281362
font_01_sfnt_off0000d850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD850 10604 bytes
SHA-256: 7c173752afa6c782612a8b67dab04b3f5c6f241efa45644794b975be2e8c166d
font_02_sfnt_off0000f07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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