Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e0f72344fc526be…

MALICIOUS

PDF

78.7 KB Created: 2021-09-10 02:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 03d6f23f5a4f009dd1ba7a8e357047c1 SHA-1: b057525e439112b07abf0aa454b2b059739e239e SHA-256: 4e0f72344fc526be27be7db21a829b5db920ce50d6c6645aabdbac0d736d7fcb
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many external URIs pointing to potentially compromised websites or disposable hosting. The embedded URLs suggest an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://intrastorg.com/userfiles/file/pajaxigu.pdf In PDF document text
    • http://7sate.com/filespath/files/20210904200537.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/1119336304.pdfIn PDF document text
    • https://telorgabus.com/contents/files/kajuvemigif.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/kuxomopa.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/lefatiremawoj.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/21316645086.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/zimopesil.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/c1974e70104c4d8997bd752ac6373dfd/fuzulejudosa.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/fenota.pdfIn PDF document text
    • http://klinok-saintp.ru/files/disomowuvuzuxujomozakekow.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/qfuimok4kolthnfi089a1e0st6/54511947554.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139f900ba711---13270025751.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/jaziwifunupotexike.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/5748652714.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/81469621525.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/nujofugapunujobo.pdfIn PDF document text
    • http://innotack.com/userfiles/files/diligefugovasemanelisajus.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/1572253973.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/mikusub.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/xurugakakur.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/45718204383.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133656d615cf---lidexetenoxulapuwixasus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=redmi+note+10t+reviewPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB506 10404 bytes
SHA-256: 97d3254af3d40d5376cf612ae71a37d39503c7a97fa3b5df4a4baa19902fce2e
font_01_sfnt_off0000cc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AD 20192 bytes
SHA-256: ea83e1e100cca5e556efa44de68646397a5b7a1761146ad9daec49b76c57d31d
font_03_sfnt_off0001168e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168E 16360 bytes
SHA-256: 15e30f006acb33bd26f9b7c8dbcdcdc2a9919b78faa7e240516a2a137fb5652c

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