Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb10ff3dfaa7409…

MALICIOUS

PDF

70.1 KB Created: 2021-10-02 21:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 79cc6494739e2347def7ccb075721c0f SHA-1: d9a464798c7559e83091ec9e6426e0f780d3e6f9 SHA-256: 7bb10ff3dfaa7409cb67fc5bc9af6be09772249943e0ce4d74b2d40b6f7f4b7a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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 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://hankilfood.com/upfile/files/42706416013.pdf In PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/12531020497.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/xajogegorirenexewow.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/69216580189.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/40902307769.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ernsi0gd7t4p8mv7s7ulbsktka/99124728308.pdfIn PDF document text
    • http://jcpingie.be/public/files/60535595339.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/kowubufikevepejire.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136062d8eba7---moxibojonomufasojegirag.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/zofinexagavegukenezu.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/11235071979.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/vowulatexefugorimikuvux.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/padifokixowuludoro.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/ximevisoletav.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/66590283062.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/jamogamonadekuw.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/76619378230.pdfIn PDF document text
    • https://longhoang.vn/upload/files/60509755934.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/tifiledarexewutokogowapav.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/85379171628.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/negot.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/ejdiug0bg605qqoevfttipomn2/padere.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/47761743671.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/zanex.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161495cce43225---tofamerapagifilepuzukej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=mind+your+peas+and+cuesPDF 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_off0000b449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB449 15108 bytes
SHA-256: 1c7f9d318c460194e9cabb009bd078a5b5c4f3ad903f600a283d6674bfe02da8
font_01_sfnt_off0000da7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF296 10568 bytes
SHA-256: cbea0288e1df19ba31b6e29ee727bd98f3c6a7e810074b548ee35a8831595812