Malicious PDF — malware analysis report

Static analysis result for SHA-256 826c15bf04ce5993…

MALICIOUS

PDF

74.9 KB Created: 2021-09-11 17:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8f2b7465243ed51dd016bd6fd6685b71 SHA-1: 74adb0d0bf79b4491502ba08cfa3489709e8d3e2 SHA-256: 826c15bf04ce59939d834778644d81af2e75df9fa5ae448af65c28b40e251750
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains a high number of external links, many pointing to compromised WordPress sites or disposable domains, indicating a likely attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://garglob.ru/uplcv?utm_term=sdmoviespoint+bollywood+latest PDF link annotation
    • https://futurefacesnyc.com/uploads/file/69205628606.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/a6e2556c7add6a622333b4b370804567/97074812311.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/xasunipamowen.pdfIn PDF document text
    • https://cubic.is/userfiles/file/33748457048.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/dukogamonikotapew.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/61881109060.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/powopake.pdfIn PDF document text
    • http://sjanzee.nl/file/meripedaxulenaxekalujux.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad8e8e1035---xisowokuxubopagav.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/vafimefikowix.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/gesokotedeg.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/92939012747.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/jupumikekuzonixuvupif.pdfIn PDF document text
    • http://ebus.cn/up_file/file/43885301076.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///somaxunogirijunoxajosifen.pdfIn PDF document text
    • http://palami.by/images/file/bavejutidibarupelimutuw.pdfIn PDF document text
    • https://zzwgjx.com/d/files/veralovene.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/vunaredomorikimefumo.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/wewodevomosiba.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/15006177d55f405d1f55ee4094bff7fb/nawavakafalix.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/faxefodel.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/20585337769.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/luriduravu.pdfIn PDF document text
    • 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_off0000c35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC35E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB75 10936 bytes
SHA-256: 526c56f48a07726efea8ad7eb12fdee645b814579d0e41719abf916abc221bcc
font_02_sfnt_off0000f49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49D 16168 bytes
SHA-256: dee73afc9b18028311af46deb8e2fc17917bf4b5ba0f501733f81d675ee434aa

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