Malicious PDF — malware analysis report

Static analysis result for SHA-256 1811a360147d19da…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 23:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b04a26aa7c5aaa28d1a9ec6a62778107 SHA-1: a09865704a9f40f962f9fab78b09d33d9f788652 SHA-256: 1811a360147d19dadf838d4e3e16d7b2a2664ce0e71eeba569fa968110e0635e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://brukbet.com/user_images/file/zezevijazizisoda.pdf In PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141a088aa767---19998617286.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/63508968554.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/lexiveju.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161369e3b5392b---lopetifoxozigonutug.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9facee036---94211008314.pdfIn PDF document text
    • http://mega.kz/media/upload/files/59790620512.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/33623187886.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109121710115254.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/12151780342.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/55626119302.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/36553560496.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/87145108674.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/44283187929.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109081952019322.pdfIn PDF document text
    • http://erpos.sk/data/files/96945801332.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132676b73ea2---71328283798.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/vudazukuxepomubelukumeniv.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/43078441394.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021982214104046.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/zowiredotez.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/92376983781.pdfIn PDF document text
    • http://mextro.de/upload/files/zuviju.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16137a7da7289f---mipemuzona.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/povogisomoziwelunedan.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f516c0d0b2---70398359817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=football+rivals+hack+apkPDF 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_off0000d784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD784 18620 bytes
SHA-256: 714fc2b87edcbfd361ad8af28013d0b5a69940dac486442f39937b25bb178692
font_01_sfnt_off00010812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10812 10512 bytes
SHA-256: 957ae41389c666548c70773fe77a93a651e8250da409f76bb60d6a5a372e94e7
font_02_sfnt_off00011ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1