Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a10b324e94f8705…

MALICIOUS

PDF

82.5 KB Created: 2021-09-11 17:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fccb5c1cab45dbb1bcd8d8bd323b7d24 SHA-1: 8e188bff3551645e9a54472bad0f1a83429d50f8 SHA-256: 5a10b324e94f87055a815e73abf1b8aa3ad7c3a23a3392c3852f985930404d8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which point to compromised CMS uploads or are structured as link farms on disposable hosting, suggesting a phishing or SEO manipulation scheme. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the presence of embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://zweefvlieg.net/userfiles/file/21976720771.pdf In PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1612f59be0017a---2566820587.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/10213154953.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/51449456748.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/jutafakigavatenojisula.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613491d097335---39118663665.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/44243276595.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/58273417310.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/vinurefoloterukilugojed.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/sozefatuvoxaluraxigujurol.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///94302837034.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/xufejanilubugalusojedu.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/4643782979.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/bupakarajakovarosufaruv.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/18549711055.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/0nn65eod133p62jtt25isl46ql/99862648568.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/damafapukulobuniwu.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/mijasajagujewapinig.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/pafegavamatexafimobametul.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/gakisupozo.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/2a6b4dcba6bcf48fb95de28114284326/lamuwosavinebofepuxatudov.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135ec2fb69bc---14829613096.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210906_C92358F76BD3C09B.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=apa+7th+edition+online+dictionary+citationPDF 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_off0000dd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 17720 bytes
SHA-256: f8f3b1c0f947118f724ae586d5582bd7223ade9cc32c9681c09999416d62b7c7
font_02_sfnt_off000123b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B7 10588 bytes
SHA-256: 09421e52d0905a57de76cc1872cd15a6c022c87f176026b911613458de3f96b6

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