Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d8d5090c33d9b2…

MALICIOUS

PDF

70.7 KB Created: 2021-09-18 15:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 28144b61d5eab1bf3eb3e6d5454236bb SHA-1: 0fef6487b51d5288360ab536425e1e99025859b4 SHA-256: e1d8d5090c33d9b2acaf52c2a82419f551cff83b6ed7610a34cf53daad911f6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://medvor.ru/uplcv?utm_term=como+descargar+fifa+street+2+para+android PDF link annotation
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20121965953.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/62000395309.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/57848686358.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16143760893fd3---35957418141.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/24949808967.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/64259714456.pdfIn PDF document text
    • https://pbanerjeeservices.4digitmagic.com/userfiles/file/lanifulobitejutinusudak.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/nopunod.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/87470547581.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/zotad.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/nenenugivowowilumisaz.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/vekijusexigedezupo.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/kesizolimunuxiguleti.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/30595567023.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/liduxafavopagobosexup.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/tujagoted.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/wigifakupugifujad.pdfIn PDF document text
    • http://pasaru.com/upload/files/zalatogivubolotag.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f06c094e63---jofases.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141b8020921e---daperijiripekikujufosi.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/97754086034.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/57734666427.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5d804003e---temimitokugap.pdfIn PDF document text
    • https://masukpt1.com/contents/files/54983393815.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c167d9d5e---44502120426.pdfIn PDF document text
    • 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_off0000b305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB305 11068 bytes
SHA-256: c1bd924e796f6f69ed96669fedfade01b27984c1bef7fb79ba24558eb2222c25
font_01_sfnt_off0000cca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA8 15596 bytes
SHA-256: 519f260b55958b3c4d18239a54179436692e1081ff90e1722f5e26a7d88e9bdf
font_02_sfnt_off0000f502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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