Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b84a26c05eb4d96…

MALICIOUS

PDF

85.0 KB Created: 2021-09-09 16:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ef94b8a402c8fa55890e67896be2d8d8 SHA-1: 3b563290a449c2ea00cbc0b34f476954c4d606eb SHA-256: 5b84a26c05eb4d960a2466fcc7d050cffec2efa917550b9a7dc72709283ef593
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URIs, many of which point to compromised websites or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to external malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161394bdad70df---gunujelebugoniwewogud.pdf In PDF document text
    • http://leeandrewdavison.com/download/gojusutes.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/47634781987.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/lakorikegijesutegoje.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130771d2d08f---kozegafojinefabowofas.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/16818149423.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613563082c98e---50051783952.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/62504406451.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/69609606099.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/gumupolepubipobizosibosow.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/sazawidijokojakot.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/3544920637.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/viganifamoxarajuzirud.pdfPDF link annotation
    • http://thegioixedap.net/upload/files/xifone.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/buzapafikeviwale.pdfIn PDF document text
    • http://centronegozi.com/public/ragovuzikozuve.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/simodofideb.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/e5fb199545185b7754ada7637ac1bb17/xetofiwebasuputukukakopeb.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/libonepozetisotide.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/65364553014.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613591dbb8ecd---kinedimunozowedu.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090812474873499.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/2555252122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=stepford+wives+pdfPDF 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_off0000e72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72D 10408 bytes
SHA-256: fcafaabd2118c1ed33133c081b0f45cd3da1bae9aa018269dde37b92caff6534
font_01_sfnt_off0000fee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F9 18300 bytes
SHA-256: f175ffadaabc4b44323da572aeb44355f34ee635753759c0330df4ae16952c9b