Malicious PDF — malware analysis report

Static analysis result for SHA-256 b985b745717fcce7…

MALICIOUS

PDF

86.0 KB Created: 2021-09-13 04:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: feb5868c3c15da75b6177cc72ee43731 SHA-1: 6e2d661a1b3d7bcced0ba9683351cd8a6f1a8dad SHA-256: b985b745717fcce720433dfeba053512c322b36fc5069abb6431c61a90bfaefe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ctcinsulator.com/uploads/file/komud.pdf In PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/11288738636.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/jukudasexipege.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/julofu.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__612FD45661B5F.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/69462202040.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/jejev.pdfIn PDF document text
    • http://elma1.ru/!upload/files/jupusitoxubofaronuvuterij.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ddf0ba45b---10614731960.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/nukoxenuleravo.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b1fe55abb38b0d553d5d2cf54bec597f/97326454075.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8e255a2f0---zalipidufizuvag.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210912_0026EA491C3C3834.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/62788710679.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zapagomelifutaser.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/43988016876.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/fokugimogolizerapezowop.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/senituviwozegim.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/ponutajarugikowi.pdfIn PDF document text
    • http://sial.pl/galeria/file/zaxameguganuxobuxaviwefox.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/9idvrph6sn4eb029olu5jl9ct5/zinokerupuvifapada.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/xudifekufef.pdfIn PDF document text
    • http://oreopay58.com/ckfinder/userfiles/files/motak.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/bivadikilepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=minecraft+java+edition+download+apk+filePDF 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_off0000e741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE741 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF58 10812 bytes
SHA-256: fb7d50b5e433ebcc337163399bd0e81a07cd15eef40f395de740949b7f464762
font_02_sfnt_off00011868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11868 18676 bytes
SHA-256: abcb7b3a08c754fa4fb13e56e397d335011fc0043da66476a591bc41ab3a1169

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