Malicious PDF — malware analysis report

Static analysis result for SHA-256 700b06c7f20ae1e7…

MALICIOUS

PDF

80.1 KB Created: 2021-09-21 03:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 819b7621bf44e191356c3d9671ec675c SHA-1: 49c84f8c4e9b50d5b321f0d65c24bf42e0f548b4 SHA-256: 700b06c7f20ae1e79daf3477da4f31520a18c00624bc222521b26c7686974e23
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous heuristic firings indicating it is a link farm, with many external URIs pointing to potentially compromised websites or IP addresses. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 http://architettotamborra.eu/userfiles/files/56596907388.pdf In PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/padonatolawediliberuxaza.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/54164630683.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/watagekop.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/47762714461.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161432e1a5e40a---26505761614.pdfIn PDF document text
    • https://successalpha.team/upload/files/84706252596.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/nuliguretawiliwizexem.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210912_034532.pdfPDF link annotation
    • https://pergamine.com/ckfinder/userfiles/files/kavaxosudekoronepusawiz.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/gunejasomafafivusakon.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/3d1a957712cc3611f3d8e99326e93765/wofeka.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/84066874736.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/lasisoputalodum.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/16784497819.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/kerunejavadofawitipida.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/99104964574.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/92228631782.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/falexebadegaxok.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145761a72cf6---punajinazaxekebut.pdfIn PDF document text
    • https://jobtiara.com/files/files/pilos.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/26416882208.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/15203639399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=download+millionaire+match+apkPDF 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_off0000d257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD257 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6E 10792 bytes
SHA-256: 360d52175057e6f47dd0ead5294df2cca3f4934a028dc07f7e5b687a663a60ca
font_02_sfnt_off00010310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10310 18192 bytes
SHA-256: 40e83560f6be0fa06c251ecc7e68b23ee44deb92273398ac27eaabca719c9948

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