Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f8f878962eac524…

MALICIOUS

PDF

85.7 KB Created: 2021-08-06 19:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d1d4e8039cf28a5a7d811e37754cdaee SHA-1: 0154099b4b9ee8fc4ddd6d62c659625968c1162c SHA-256: 2f8f878962eac5241d042de3757537bf6eac5f0d5650fa484afee33db3a1c09d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and URLs pointing to potentially compromised WordPress upload storage. The ML classifier and ClamAV also strongly indicated maliciousness, specifically a phishing trojan. The embedded URLs suggest a tactic of luring users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85368d9916---40771565087.pdf In PDF document text
    • http://jrpst.pl/userfiles/file/nexodutiribevi.pdfIn PDF document text
    • https://alutat.com/data/file/zulebixunulule.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/83745181690.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/18723397624.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/a5das8krnv1mh010fq5td8c0d0/fuxipobazuzesonode.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/drqlrj391catmgkjtrlgtp72u6/13947632728.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/wovuliruwepigesene.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/lunosova.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/af62747ce6946961634740af971091f2/bavirerudobakirevawagexi.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4a385680f---wedevolibi.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-10/20210510081105182707.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/1219997768.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/2cd6633a0f50d3108614df6ff5332f7d/56826509533.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/eedf4cba2e1d7cd9003655c26ab53a2f/33381148355.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607861caad69e---34752078814.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/verafetorubum.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1483567209---1883211514.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/b62a6d6f59f4e3a6ac23fc371a62a46e/miwilutilejukiziwaguzi.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdda3baf8e---1386175961.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607591a9a08a5---nesapojobifosaxuf.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/92781252581.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/39010950544.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/2472917d6364fef0372c60d290a7a81f/32622300804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+handbook+of+discourse+analysis+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_off0000e994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE994 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A6 17196 bytes
SHA-256: 96c85e5e31511bb2c43294c51a5770672c23edf769a8a608c1f473febd125039
font_02_sfnt_off00012e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E21 10984 bytes
SHA-256: 3c770243e8cc7adaed896eeb8a716f16568747fe67fbdec9d85b6f3371271df5