Malicious PDF — malware analysis report

Static analysis result for SHA-256 61cb40936a8cbb4a…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 03:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8c5390b7f79349aa47948d376664a7e3 SHA-1: c5f995741b51913e7b24484917a0fc2f2afa5a11 SHA-256: 61cb40936a8cbb4a539d04cb3c06743bce95b7a926bc0d48e1c2a6edafe68172
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous links, many hosted on compromised or disposable domains, forming a link farm. One notable URL, 'https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=internet+explorer+11+download', suggests a lure related to downloading Internet Explorer 11, a common phishing tactic. The presence of embedded URLs and the link farm structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://le-nora.com/userfiles/file/70021045990.pdf In PDF document text
    • http://www.ujepites.hu/userfiles/files/38348265986.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/58223415224.pdfIn PDF document text
    • http://fitviewer.biz/files/file/jufixonivo.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/wiwowaketojeju.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8166af62393818d3864ad44af3b2e5af/67432531010.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s3osll3inrmg8s3i3v3cr8nfj2/nonijujoxebiraruwo.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/hfssh48i0h224uolk7j3mlubm6/nemupixetozili.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/76006608696.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/72052372133.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/77764770225.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/jimoxevotomu.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/110294287261467077cc29f.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/buduxusupudojipovanekex.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/61248925543.pdfIn PDF document text
    • http://18554080.com/userfiles/file/fukoxowo.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210905005314.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/suxoze.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/liwevej.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/feruxojisuxotuzoluz.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/siwozij.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/zajadegirusajolovefe.pdfIn PDF document text
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/lonog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=internet+explorer+11+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_off0000db64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB64 10316 bytes
SHA-256: 6dcfbf8fd67b35f686b101b6d8bd5ecc91159c88e583b9fc6557a49d48547a61
font_01_sfnt_off0000f2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DA 17888 bytes
SHA-256: 74e2ad993a818a9316475840810915a82ccb8780023155b20efc9ae76ec6c724
font_02_sfnt_off0001217d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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