Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa57bd6e3163ebd6…

MALICIOUS

PDF

79.8 KB Created: 2021-09-12 14:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4f63426f58ccba90e4d5fffedd4369d0 SHA-1: 9fca713c9e30cac49566810f6da07a5835f33f37 SHA-256: aa57bd6e3163ebd643e2b001c8308443cf1aa861e42c985cd4da4684959eec4c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, some of which are identified as compromised CMS uploads or hosted on disposable domains, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gat-asset.com/CKEdit/upload/files/sewigonizidinixojebowejuk.pdf In PDF document text
    • http://autostyle-japan.com/js/upload/files/58532442882.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/82412362709.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/kagulapuvofejinisalarev.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/48808148902.pdfIn PDF document text
    • http://runhouchem.com/upload/files/vijumujepikurudepe.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/negubolus.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7076202e8---zetimidiref.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/85929903626.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/gawubatusovovefufevojafax.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/79824281789.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/jofuv.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/finodirekisebevoda.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e5c936ee4---62048499956.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/regewufugelebi.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/luxosetosekajudome.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/ronejosir.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136b644e7532---nedax.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/82868067984.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/20440899659.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/bavewo.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/81509880469.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/wokavuledukugixowodaregir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+reduce+picture+size+in+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_off0000d41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41B 17528 bytes
SHA-256: 88f7d7f3823445a57a07f2276e5e0869e08e6fda47ef14c0ebbd6a80e04e1ad1
font_01_sfnt_off000100ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CE 10696 bytes
SHA-256: b5e32e0ee1834d66fbdd1e98d3126b589a6d3696549f98591bc4dd626f34dc32
font_02_sfnt_off00011983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11983 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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