Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb688ed58558fa1…

MALICIOUS

PDF

69.8 KB Created: 2021-09-08 15:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e0edfbb8c0a8f94d564414d229de60c3 SHA-1: b6f8366bfa8f1aaa88a24d1fcfcb65cfef163e59 SHA-256: deb688ed58558fa154a289edb07bca48c410f63595f717c4008c4dfce2fac48d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates an attempt to obscure the final malicious destination. The primary attack pattern observed is the use of a malicious document to facilitate the download of further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.solarwindependence.com/ckfinder/userfiles/files/somejuxem.pdf In PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613668ae2c356---33192841406.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/65590186730.pdfIn PDF document text
    • http://groupelamiri.com/uploads/FCK_files/file/tatazomegemipuvemonator.pdfIn PDF document text
    • http://medrea.ru/upload/files/18274403638.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/81671984880.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613083100ec6e---sefunadijexetobobidid.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/44258503281.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/kukuwuvagunin.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109080247058293.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109040902277714.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/11352089152.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/ranirerudotuwaziguwofaz.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/49348979748.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/58182431160.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/40157483006.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210904111603506.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613872c9d4368---zobunujelaworedev.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/widiporibixawagelup.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16132fa182916b---71509292943.pdfIn PDF document text
    • http://youil.org/userData/board/file/fumizukotu.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/parafedasupigunidakibojor.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/45323521928.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161325ef658a35---90560100999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=dermatitis+seborreica+diagnostico+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_off0000b1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E6 11060 bytes
SHA-256: 3c79071956f0a4fa39cc40a7c6f0b5d62a023e1256744bdf5b4bc461b76c0c94
font_02_sfnt_off0000e33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33E 15284 bytes
SHA-256: 418f799bce3413ae1dd5b431d5a7d53c84a50f3fd921827d88f653d18c59b13a

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