Malicious PDF — malware analysis report

Static analysis result for SHA-256 22bd253193756d3b…

MALICIOUS

PDF

91.5 KB Created: 2021-08-10 14:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9616eb6dc9be04dd233670aa17c4d37e SHA-1: 887d2503a256c9aed908ce567be837d00ccba8b5 SHA-256: 22bd253193756d3b7ed0db8b3a22b08ced0ec68c7cf50d1f47d64fd2a92deb18
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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 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://www.ctnphrae.com/ckfinder/userfiles/files/89851378209.pdf In PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/besabudebozizema.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/s8ruu41r7quljcceqrm4q4tok0/gewulafuv.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/finusi.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/4b56fbca70c5185a05642b66412f0bfc/91313444607.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/c4ef72bd449871f82cd2c045077ccc66/78788016383.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb90a10a6c---fufuxijugupaguninisuru.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/vovusagexesudiz.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/015fbec5b1de36d17dfc1e35e8343103/56115651031.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/24957768779.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9d66014f3---19417153010.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ec539d04856---linozul.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076342ca7b02---wonekefifidiserojuvowowi.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072992897659---tuvijobafepolelalovomiwu.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cada4e174---66131568533.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/xojobijuzefomagudugex.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/77706886478.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/wafumusawonunozibegow.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c619a605759---9873679223.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c89137ad9---99722343710.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/wuwimijus.pdfIn PDF document text
    • http://change-sexy.com/files/files/11627417871.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/demapakobonomurif.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/zinoradugiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+calculate+molar+absorption+coefficientPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FA 10956 bytes
SHA-256: 8188be9ee5e5227a8422c10dca49fb5a12da37d1bafdb8857c03d0bd1d6f14f6
font_01_sfnt_off0001032d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3E 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68
font_03_sfnt_off000130d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D6 18612 bytes
SHA-256: 409d471ad7e00f367ac7f6ddbfdcbdc3370f8aef335e7d5f6df1939f0603251a

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