Malicious PDF — malware analysis report

Static analysis result for SHA-256 b742bc0156f4e67b…

MALICIOUS

PDF

71.5 KB Created: 2021-09-09 21:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f4e861ee07a03c36c39c652c6ad17f34 SHA-1: 164013ba8094cd6da4d8c095a7d1e1674b39f84e SHA-256: b742bc0156f4e67ba9ebf8a7b14de942a8ff08609bf800ef00fabb97471ff53b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple compromised websites and disposable hosting. The embedded URLs, while some are marked benign, are part of a broader pattern of redirecting users to potentially harmful content, likely for phishing or malware delivery.

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://eminentland.com/admin/userfiles/files/komefuwanusamixago.pdf In PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-1/20210901070830943586.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/rutitasepewikuk.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16131bb5fa9656---52114141591.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/44045920928.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/suxizimebelujulij.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/84156491201.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/66518409338.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/vixuxakiligigawebapaxuw.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/seluxewivafajakotirinu.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/22836220968.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/67083358090.pdfIn PDF document text
    • http://8njl.com/userfiles/files/84364604401.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/97306223658.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/14580613625.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/49574726538.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161307e09b7965---58126551571.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/smpud19m9mk859sp6ovlsgt8er/kabixexinatif.pdfIn PDF document text
    • https://umutfm.com/resimler/files/42288824900.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/80214076408.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/30082774562.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/zaditadoxaranomaw.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/fitisizogomidulonufatuvi.pdfIn PDF document text
    • http://bndweb.nl/upload/files/90022882197.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/tizagisapewemim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=does+factory+reset+turn+off+find+my+phone+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_off0000b772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB772 15184 bytes
SHA-256: adffed4ae9543eb97be00364dbf6c9ba98ae435abdf0c05a9c5da839f5210ba1
font_01_sfnt_off0000de3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3E 11052 bytes
SHA-256: e95dc1bdfeaf9ea2910d188eea8c7e429470d9c9cc95678bc647facb6ec5b4cc
font_02_sfnt_off0000f7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1