Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ecdc303826890f5…

MALICIOUS

PDF

95.8 KB Created: 2021-09-21 04:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f1816f0f173095062a9679f4cb087ea2 SHA-1: d0422513815d0783137035b5df394f4f87c9a338 SHA-256: 6ecdc303826890f560924644efa94fb00bca8240f7fda8705556ae255d24c5a9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nano-vip.com/ckfinder/userfiles/files/belotosewonodali.pdf In PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/pijugimedanoduravobu.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/tanabanotimevopokupekan.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/37658968059.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/5b01a8d2b292732c1f3c7bce1d724168/43132177658.pdfIn PDF document text
    • http://healthywithhart.com/res/file/88975297067.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/53386265273.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/dupakipaxotugoduzomar.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/vopogitedereb.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210904180730.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/bataduzitipodamoliporoxi.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/kalanatonupagiwizekikewo.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161468cc66b89f---51466423000.pdfIn PDF document text
    • https://losungversorger.com/product/file/83219669194.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210902_043124.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/zadibupu.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/4377778972.pdfIn PDF document text
    • http://fruitvita.com/files/files/47143304682.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/29998293541.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/xekawirupakabaruw.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8a4456857---xesejebe.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/biwaxedijufetinefo.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/468465646bed0b72cfd2d1c4d0ecfb06/11189031871.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210918223426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=ig+hoot+instagram+followersPDF 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_off00011104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001291b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291B 10696 bytes
SHA-256: 8bf6e1a36e781f238905b83ecdbf8869dc10f42f68e2d9848e928bc56d4cff22
font_02_sfnt_off0001418b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1418B 18416 bytes
SHA-256: 2af98c859f995f26a7637c70b307b237ee2a83b7453fe93a15a1a5ef9e633382

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