Malicious PDF — malware analysis report

Static analysis result for SHA-256 1beaf792be044c06…

MALICIOUS

PDF

154.5 KB Created: 2021-06-27 00:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d0b7679c347e26356417f8a41da4c8b9 SHA-1: 3c8dcddf9d7f2384d8ea94e9004526d725054b3e SHA-256: 1beaf792be044c06fefecd6686026cf51d4dc92626b9e4c9a3f997f2b19f2670
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malware or conduct phishing. The PDF_RANDOM_URL_LINK heuristic further indicates the presence of algorithmically generated URLs, a common tactic for evading detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9838

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=how+to+be+an+existentialist+pdf PDF link annotation
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609633fa96b33---5763996696.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/9iuim64hiaccg4tiolelckslk6/zosinevupogobubofile.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/iu7ujflu31d4sk91skalnsd00d/sonomagapulimasorufona.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/bokikafolomapu.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fb46be35f---sogeganiloniv.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/91919477049.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/8pc2idfg00qlnt7h9rlvr1aqcb/zuxilaxiwesunuratanogabe.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/qteuf17uqq2a7nrmubsm32ct7h/riwuropolevukenepepil.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaaec777a9---44326211495.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/tobovabixexud.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ece255aaea---21033671152.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/68f83cbbd6599f9e631a9bc2908d3047/70127560531.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/kemanoneporaro.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/56ckql4sdl172nlrveems79vse/kovusegogagajabo.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/baloluxusodosotusesu.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/90201252959.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8f7a3cafb---xekenuxipi.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/93e15a155d9d554454823adf7d715dd1/28443684844.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/3a0fb11c04ab0d9ad00483abb59ff02c/30105366360.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/83087873143.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/nj4eon2kpss5kan9fqfkn4isnk/gejomum.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/dd2303b221351acab76ad3101dd72a3d/vewonogig.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001eb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002035b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2035B 10708 bytes
SHA-256: ff708e21aedcef6a6ceafd4f1e40f23e9159609c4ff260d751f065fcc11c569a
font_02_sfnt_off00021bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21BD9 2748 bytes
SHA-256: 24fcfc5f29564fa38634ed72ad66fc2634e08f7f35a3f24a5f6c856ad836bc91
font_03_sfnt_off000227a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x227A9 19696 bytes
SHA-256: d6739f57603ed1cf567110b1faae18db4f209afcc13ad42f1d9cd2c312208d6b

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