Malicious PDF — malware analysis report

Static analysis result for SHA-256 25216dd097c373bc…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 07:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4fa6c31fe9df094829ec7901e66bdea2 SHA-1: d742426a3fbff6718173506575a111640c17e28e SHA-256: 25216dd097c373bcbef5b5bd3079625536b3ad2728b31dd4b501ae7a3bea462e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with numerous links pointing to potentially compromised websites or disposable hosting. The presence of multiple unknown URLs suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.bash.cl/media/file/gumubaxawoxabuvijoz.pdf In PDF document text
    • http://deauville.ru/files/file/tudapatusak.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/dabefulobupiwezivigologim.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/safodoxirexof.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9efc1ecdcd---47302058965.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/nofapalozekodalumiwakik.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/84355765581.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e318f1944d---22667190312.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/24297873305.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/d184717591f4e590cf378a56d51b8405/maboxukofalulipuf.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e01e2d18fac---32506118770.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/24195854092.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/76a147cda65851ef85c0c8f2587c670c/39361750435.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/pilamuwafafowarokewuxa.pdfIn PDF document text
    • http://mega.kz/media/upload/files/30472145059.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/84e5822583a201f3f8ea3e42c7dc6420/29302502236.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/xunebezetenikido.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/nolawaxuvomuwidejok.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/88e18c38825028c4342211319b7c0e89/12238705639.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6138cb8d72---bitofoburalezeteta.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/60442380227.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/fad81e30df0de9ed2608477aaebd2efb/1522461205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=nipah+virus+treatment+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_off0000d859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06B 17580 bytes
SHA-256: 35a4614d82c3e400219179fb54af31bd93e612edb308c6929f77a723bdbfa9ef
font_02_sfnt_off00011e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E36 10740 bytes
SHA-256: 9b0b3e36f68c53940e85fbac26cc75dc68aed6d90fae7e1c1a7dc2074b733dd0

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