Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05dc319db1d0b47…

MALICIOUS

PDF

100.2 KB Created: 2021-08-05 17:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 22ef07837523825a3842e9f0a105729e SHA-1: 08026371169a0aeb9f13ad66ddf785cc768a7c11 SHA-256: b05dc319db1d0b478219bd3815ab96122251474d183c861d8bda4a1b992516b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm or phishing lure. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of embedded URLs and the nature of the heuristics strongly suggest the document's purpose is to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc60d28d3b9---podox.pdf In PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b12d4054c6---venobipibuked.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/86111560103.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/vepug.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161095f471cc65---7740037008.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/qmaeouvmim4muu978af2ih39oq/guweridanexibixerikoz.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab7b800b01---gitimagapatabuvesan.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e23fdd37a1e---63550728610.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/guxumupenimezulu.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/89d99feb38fc711693df95e7c5ce57af/besop.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/37506710713.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/lixerimij.pdfIn PDF document text
    • http://bdn10.cz/files/file/segazugemakamipij.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/0fe7b57b6e61b6d0d016c5fefa6ad509/vaxuziwomituretez.pdfIn PDF document text
    • http://poorclarescork.ie/images/3279312164.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/39355513770.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd59fb86a66---sugegalurezapowezabot.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/45128334901.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c86d040b52d---suram.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089043a032bd---60725926838.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87ee294c9f---barop.pdfIn PDF document text
    • https://miruyuta96.ru/admin/ckfinder/userfiles/files/17277757526.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/sipen.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/biniwejuvogavudilakigig.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/2bomae4a9piscsb72de8gu0ei5/dutudorubum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=jim+crow+laws+worksheet+answer+keyPDF 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_off000123c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C8 10780 bytes
SHA-256: 873f4f015b6dbc76f24fc3ffd5e1215d5c2636d5b24110ef478dde0287aca92f
font_01_sfnt_off00013c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C84 16924 bytes
SHA-256: fabbd6f306de81ce76d8198e878d20136afd30ad6ae35b20f7804939202ab1b9
font_02_sfnt_off000168c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1