Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5057453c5f0ca18…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 12:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00aaead5625b122adc81d35db3c32659 SHA-1: b738af92a629b5efc60c616b78d29e76e23812b5 SHA-256: d5057453c5f0ca18bbf35f535548ee0e06f0b755742d8283ec7e4f774f4e3c02
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised WordPress uploads or disposable hosting. The document body is unreadable, but the presence of numerous external links suggests a phishing or malware distribution attempt, possibly initiated by a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://wordtmann.beckbauer.eu/ckfinder/userfiles/files/jiledizovexojate.pdf In PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/bd2e9890eace42bee7e133880880bed2/44624461757.pdfIn PDF document text
    • https://conrays.ru/f/data/53992593255.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/11239102963.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcc916bc3f---22746028313.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/redewipiza.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/4763762545.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/11421335093.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/16895253629.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/valokofotoko.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/xigapavefu.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/renijiwivoruzor.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/fiwowekinidi.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/77111495929.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/kobimadexibawule.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/93310007752.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/30383475509.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/72286354374.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/42126616699.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9308c8582---bikadovarumewo.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/disokoxewalapefupetisoku.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/9988406386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=implement+qr+code+scanner+androidPDF 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_off0000b04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC864 10772 bytes
SHA-256: dac1cacc161987febe46fc60b6ae95dcead9df1ffb57b605b6d233c0b624aa47
font_02_sfnt_off0000e0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DD 15460 bytes
SHA-256: ef68b6006bbadfbd6e310ba992112260adf190adafdf6c3c040e89de57a56140

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