Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59849a4ddb5c073…

MALICIOUS

PDF

94.2 KB Created: 2021-09-08 00:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: db3d3040fceab73b41758f605c25aafc SHA-1: 9fc24c92ec99fcf4af6a4106aae4a0db08878bed SHA-256: b59849a4ddb5c073840c429f85cb2e56bc355a94540d976afb16340c7b48e4b9
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944b7e25432---62698601982.pdf In PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/43410281333.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/eaa13908b63b2fbd2d672b88f704565c/68261279982.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9e6bd6762---80618123376.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/fivufusireluvavuwidufatu.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/debexujunopuku.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jabenizuwojexotodex.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/98255563618.pdfIn PDF document text
    • http://wisewood50th.com/clients/3/35/35ca2b70ae131fa39667c240906a3fe4/File/63863809333.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/fotelevuxifat.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/bedadi.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf1d09ee1d---50634358888.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607043f44bbcc---90141005843.pdfIn PDF document text
    • http://splogservice.ru/content/file/85278899720.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/838378383.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/78315511258.pdfIn PDF document text
    • http://valeneighbors.com/userimages/33375184810.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/vijogulikivizote.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/c913ac357686b8c65a174b471ac0619b/62215944250.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/dowuzijabawijilijubib.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/35948658062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=narayani+stotram+in+telugu+pdfPDF 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_off00010772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10772 11032 bytes
SHA-256: 2423820d6b54aa04a38428f80af94b1f7fc1179d00f8f610a85c79bef3feb295
font_01_sfnt_off000120ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120ED 19436 bytes
SHA-256: 8e5253f6dc182cf83b467f9cd6996764c5bd3bfed1900f3567ce8a4479f6436a
font_02_sfnt_off0001530e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1530E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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