Malicious PDF — malware analysis report

Static analysis result for SHA-256 b655365dd26e92aa…

MALICIOUS

PDF

84.2 KB Created: 2021-10-23 08:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7fedf32c823f3219ae1892fdfc18a5af SHA-1: abfc1173c3e6567b46808b7028a7fe1dd6acbdb1 SHA-256: b655365dd26e92aa7c58d5973d2b34b38f310b1c495f169e8283a17f8f36f707
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with multiple external URIs pointing to various domains, many of which are hosted on disposable infrastructure. The presence of embedded JavaScript and a high ML classifier score, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a malicious intent to redirect users. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://atel-j.nl/uploads/files/winimuxunovopemu.pdf In PDF document text
    • http://soc-in.com/data/media/files/xenezowevemimuvematewa.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/zudiwowijepowixo.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/fenukuxuvado.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/bopidolitesopi.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/67517344279.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16160da297300e---20282643428.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/lutired.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210908_000013.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/xelala.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615269abe0d5d---pefojofenala.pdfIn PDF document text
    • https://nesbedcollege.com/singhania/downloads/file/turakojud.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/dukosibegasubalibul.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/wavalozabukukifid.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/xemozobowabajirusa.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/11520273992.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/tawupejitimoti.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/sigebom.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/masuzomikuzovejebadirumar.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/sobebite.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/32344934490.pdfIn PDF document text
    • http://profiklub.sanswiss.cz/files/file/xagunuwelopatinutib.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161717e7a15006---38903902430.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/4966525759.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/nejixanipidomef.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/4dZi1sgP-vI/uplcv?utm_term=a+complete+guide+to+futures+market+pdfPDF 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_off0000e2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F6 17860 bytes
SHA-256: cdde4df55cfb11a09c9363d1492c7dac0dff7664fb1e1390191a1c46a995848d
font_01_sfnt_off0001116c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12983 11032 bytes
SHA-256: c6dfd25d2dd7988ec2c343183804b94175f3158d327e9dd0d74b07495ca67185

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