Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73ae0a02ae9020d…

MALICIOUS

PDF

93.5 KB Created: 2021-09-17 09:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7683545d3fe8d3d82cd130459ac27245 SHA-1: 7029d45fbcd25218dab61d7488c650a4cdf9d9dc SHA-256: e73ae0a02ae9020d36fc0b83e33bcfb840b713916d2a93b5c869fcd0d0f1c1a0
176 Risk Score

Malware Insights

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

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, directing users to multiple potentially compromised websites hosted on disposable domains or compromised CMS uploads. The embedded URLs, such as the IP literal http://104.156.58.56/, are highly suspicious and likely serve as the primary mechanism for delivering further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/vokizamufagumozalaweka.pdf In PDF document text
    • https://beyondpins.com/calisma2/files/uploads/75204227181.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/lukajozegexumesifojok.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161316ac904141---98830622363.pdfPDF link annotation
    • https://auto826.vnpec.xyz/uploads/files/vobudexexugixirojutas.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/071cde49d18cf2a284a224e31820bd80/44021873033.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab860ee6f6---zikezivotaxanujukux.pdfIn PDF document text
    • https://petikdaun.com/contents/files/zixasasemijumuxubav.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/582306f4a3612d54dca1ac850c3347b9/rutirafiwiwurobalojase.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/4333455370.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/woruxefasidalefurilik.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/17061586706.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/toxaxofitit.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/92182827593.pdfIn PDF document text
    • https://timminsrenovations.ca/file/vOjeKHfEPyL6nNEz.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/12992290824.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/95116255093.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/80715706831.pdfIn PDF document text
    • http://ore-processing.ru/d/files/43655461004.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/bigejizidumajatonobunufu.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/11194941833.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/13040264510.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/86904775657.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/59924352960.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/zulonadokewodawufegeje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=2021+bollywood+movies+onlinePDF 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_off0001058e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA0 19140 bytes
SHA-256: 61528d6bf767e36ba8984ee9c656b5ab029bb77ef15fd9f34b1a3121104ad87c
font_02_sfnt_off00014fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FCA 10652 bytes
SHA-256: 3adb70043a9706a3579c3662b5a7e38616b517f8fa6f659ae4bd130d7c3d8dde