Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda2b9e790dafa76…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 12:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ca20cff65b3450382b945d8e99a2e763 SHA-1: a6c11ae27cd549a64667339857ffaa332427a5ab SHA-256: dda2b9e790dafa76f1639a9659138804b5cb63b778c559442f458a1630e58c07
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate the PDF hosts a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://smobiil.eu/userfiles/files/96197005331.pdf In PDF document text
    • http://elistaprezentow.pl/userfiles/file/78209822737.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/34358328815.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/suboxosavip.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/62870518724.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/mazevo.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/limavefuviselodureji.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/gokawo.pdfIn PDF document text
    • http://anindecor.pl/files/file/gutigepedobibasopasupore.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/148d11adcb62d1634191c4cbaf95d8c9/60366099255.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27842654383.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/mujotugapewutelaxo.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138f99ad06b1---tiwid.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/nerokuzesamidunopaduriro.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/pifox.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/werosarexusifud.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a8693a1ce---44157524317.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/gekebamabedamelubefijuluz.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/61426638616.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/5978635182.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/wawubuleponiribiditoguw.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/42192141427.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31450230256.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/a479dddc0c251bb645fe151edbb2bb34/kevukinup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+login+icloud+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_off0000dd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF548 18208 bytes
SHA-256: 07c73f07e249f970bf9bab948d5416c86e6bdfb0559bebff4821888df88ca579
font_02_sfnt_off000123fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FE 10420 bytes
SHA-256: 5c25668a2ed839cc17227df02aec746d572734a22f61531fc2dd75e7b62312a2

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