Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a0662b4c0de17f…

MALICIOUS

PDF

78.2 KB Created: 2021-09-03 20:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7989e95fc7d7bff9c95799fb5f78ab5b SHA-1: df316331ba5fe4535db754f7425828c7ea1d48c9 SHA-256: 43a0662b4c0de17f15bea7519a4ce4cddcda74d99b4f6db25d7724472bc8519c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/783c9598a88aba4cbeac31c9b851e8f2/pudegijetudozepexobunot.pdf In PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2083a0d641---bulizodijigafukewusumemil.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/zodefavuwumusigivu.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711aadd71ba---14624368127.pdfIn PDF document text
    • http://canvangdientu.com/images/file/likajofijoza.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/82510719366.pdfIn PDF document text
    • https://emmaushuis.org/pages/79286146880.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/malemivodejeludi.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16201959287483.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-13/20210613041643926486.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160deee00b2a6f---36510474868.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c49fcf3e7c---fujibero.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202108211023336132.pdfIn PDF document text
    • https://yellowstonewildlife.com/natokamagedesilurizo.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/tatokedijuninilan.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/dcm8563hak651uvpuohec5l216/nigigunevisizipajazivir.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/patosivod.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/melani.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/20c248520ea9e2c0e0a869fc4e967696/98154632098.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/5220d830adf0808f5852788ac35e9e25/47398407379.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/68891278886.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/55362540113.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/gogademibowutoler.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/938038f29c35eb306a269febcd0b1a74/7603840124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=voice+read+pdf+androidPDF 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_off0000cf4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE761 17544 bytes
SHA-256: 4ef75038841b34de9d16d629237d801f0462ef0a22f7e3eb196c87ee2e96c25d
font_02_sfnt_off00011405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11405 10268 bytes
SHA-256: 6bf0a2b0eed3880267c06b048da38821222ffdcc3965c58f2d338fbf2236af20

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