Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab750107868e2252…

MALICIOUS

PDF

85.7 KB Created: 2021-09-13 22:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cd40595f41b343484b04a9e5a38a6076 SHA-1: 70c119398bd4ce9bbe1399a7b3ce0ff39faaf431 SHA-256: ab750107868e22526af239806c6fa1a8e3f142b0cf3ccfa4492e1fc5b3b92d0b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains a link farm pointing to compromised WordPress uploads and disposable hosting, and the document body suggests a lure to install browser extensions or updates. While no scripts were directly extracted, the nature of the lures and the presence of multiple external links suggest an attempt to download and execute a second-stage payload or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://lawyergz.net/uploadfile/files/bajuxavavozibozetur.pdf In PDF document text
    • http://hpworld.hu/data/pic/Image/file/liwulomavawefotapepad.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/25665126159.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/22126010904.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/9371595137.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/7239039728.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/8907369122.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/bivagekemedowasag.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/99429392110.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/10431599889.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336c493a261---kepuvafinesaxib.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/kumixalidu.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/5659125525.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/89449490210.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e4fe559c2---xagiz.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/nukurulexezejefovatu.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba1a302a18---23217046993.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/81081428385.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/49203164473.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/fusifudokutabuvobevuzesor.pdfIn PDF document text
    • http://bjjiffy.com/upload/4676983367.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/88347148186.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/metetalo.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/xomuxixapovel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=os+chromebook+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_off0000e2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAED 10788 bytes
SHA-256: 3e1774d4e0bec618507f0b96acc0416ffb07f73db9c95779a7bc4d5e44dbc8a3
font_02_sfnt_off000113aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AA 20328 bytes
SHA-256: 07e2427bb5f17f2b3890a235f01d8c7432ad3841d72adbdaef9ed6396c44231c

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