Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e72fdda8ea2fa0…

MALICIOUS

PDF

74.3 KB Created: 2021-09-17 18:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2cc1f16eea560ac3ae09ae4274fdaad7 SHA-1: cf8bfec27151a34ce073d39753a039e07a485bd2 SHA-256: 16e72fdda8ea2fa0c24fb17f5cb684bf4dbb76a62540d4b29bf56a1020d53f35
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various PDF files hosted on different domains, some of which are compromised WordPress sites. While no scripts were directly extracted, the presence of embedded URLs and the link farm structure suggest an attempt to redirect users to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/35953947957.pdf
    • https://worldcastlive.com/userfiles/file/26849660343.pdf
    • https://sportuna.be/ckfinder/userfiles/files/xipirubu.pdf
    • http://textstricker.de/benutzerdateien/55641606925.pdf
    • http://utpcomp.ru/uploads/files/86382288556.pdf
    • http://beverly.kopanramen.com/uploads/files/vejugakawux.pdf
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/legofuzurilaf.pdf
    • https://franciscovalles.comtraining.cl/userfiles/files/rawobodudefax.pdf
    • http://mediedil.eu/userfiles/files/bopegilatubadazoravolif.pdf
    • http://turatabor.hu/media/68896025278.pdf
    • https://cairparavel.ro/app/webroot/files/userfiles/files/pojesuxiteruf.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613aee045ed2d---88374500548.pdf
    • https://toolsatool.com/userfiles/files/kozupepetuluma.pdf
    • https://euinsuti.ro/app/webroot/files/userfiles/files/nabanokajamugiw.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16143ce39e6154---90262565293.pdf
    • http://group-anons.ru/userfiles/files/81969301357.pdf
    • http://lg-palette.com/upload/files/20006708666.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6fbaf3717---ruvodebipowikuga.pdf
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/garovezawevosejewerojojok.pdf
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/gimavukamakowemonunuvijen.pdf
    • http://ryanoomen.nl/uploadimages/files/pubonodok.pdf
    • https://crcnueva.naturasoftware.com/uploads/images/files/72792503002.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614090ede7a35---vumizabodoxukidubavobuge.pdf
    • http://apluskleaning.com/admin/images/file/58766272532.pdf
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/42873270820.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=nba+2k20+apk+76.0+1+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE76 16792 bytes
font_01_sfnt_off0000d68d.bin
3bc898808face45726acfcfe2e0382c08953f6d51a2659eb83833f880bd2d30b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD68D 10668 bytes
font_02_sfnt_off0000ef0d.bin
754ebed9c0430b8572d8b422c16d1ca26acc3f4fbea22204cda16fcbfd301758
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0D 17292 bytes