Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27bd0512fe4d740…

MALICIOUS

PDF

95.8 KB Created: 2021-07-07 01:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 163937acd1119f5ce5ac0043ca1fe73b SHA-1: f774df94265f99e9214da4f65c406b2fd3247990 SHA-256: f27bd0512fe4d740514ffb2c4634aa9184dedf7c0d5b1211f5ab9f51c3f28396
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve as redirects to phishing sites or malware downloaders, aligning with the 'Spearphishing Attachment' and 'Exploitation for Client Execution' MITRE ATT&CK techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://philabc.ru/uplcv?utm_term=beautiful+same+meaning
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607081760f349---5061434049.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bnd2hjd75gqoh1jsivu0gg84k0/13980148116.pdf
    • http://mispuntossaga.com/campannas/file/78355139565.pdf
    • http://stellarp.com/userfiles/files/64732233750.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608365204ac2e---rovori.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e8d216c998263cb12e19aa50193c6ac8/51237647944.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76212359f---62238557816.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/dcb869e040ea15fc6a5127c79de8e218/33686368468.pdf
    • http://sarlampa.ru/upload_picture/9052327185.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/0e0cae24fc20e62fd0636e60e712accc/78060097636.pdf
    • http://alt-1c.ru/userfiles/file/tuvedaf.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e323b9326---85003041004.pdf
    • http://esoftland.com/userfiles/file/jolujugazesidivov.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/fd60c8132d1d4242d05408a3eae5b10f/powigigun.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c644f605641---pafiputagivoroxo.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160ad4437dbcce---80730815820.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/04hdhrjct0mv16ptptgrj474r1/771378733.pdf
    • http://aranykoronakft.hu/userfiles/file/fosuvixijexumasula.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b473257b7---rukixukigifokip.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/noidctnvsbmo5gbml8bb3qfj22/tekowexiteribagabisof.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e32fa1295---19537618312.pdf
    • https://benqmusicworkshop.com/fupload/file/60377184522.pdf
    • https://denizlihorozu.com/resimler/files/78381560440.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001153e.bin
8106381ea9a6fd8958f4ad150465a0491e070a64bb4aa6c926b1b55e37d8e58b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1153E 10492 bytes
font_01_sfnt_off00012d0e.bin
ee1ccf5717abd6bf0c02c0817f1ad9f850a1af6bf09c8ddfbda88557115c8c91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0E 17144 bytes
font_02_sfnt_off00015a04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A04 16792 bytes

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