Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3de218abaf92ce5…

MALICIOUS

PDF

90.0 KB Created: 2021-07-02 01:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e9d4524219831892355db533df94c65f SHA-1: 87215df92f927975784af1888fff30ebe7b7a3b2 SHA-256: b3de218abaf92ce52bc333eef262c8f8c034f08a12d1eb36a80da7df1fd4726e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm intended to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://allytemp.ru/uplcv?utm_term=harry+potter+hedwig%27s+theme+download+mp3 PDF link annotation
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/3c682309fea1fd1f7d1cd88017eb33e3/torulib.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/6be09d884bc67e2b608f709ce5e7d132/62333562289.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/98970693337.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/8b195qtsligm03g86foii6gksv/24553351960.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d0361066923---ravemuwonakonu.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160729bb15c276---xozajasara.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/laxofaguzizadavez.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de67c67555---34686839043.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kb6f1kh8m245s2oo4ggrcgool0/wokexujagamaja.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/b93f535ffeebbab97da7cbbbccf50c41/92480568968.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/zotuf.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6686e9e4bbbc5388d4a8d1eebf8c0eb8/10347843856.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/71f686241d66786f86eb52f26b7530f0/95740133040.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c146babe543---72351745562.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/fatojafano.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/66973969329.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/3184f8162a91d8ec07f2a18906b0b513/3187368655.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b53d77deaa---67754231541.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/25305663091.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/47dea41dbfb044388182b0979fc2fce6/woxotiz.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ebbc2e5ab---sevupugifaxitoz.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/c5139166d3e711a7e5e4bee00103d24c/78385716780.pdfIn PDF document text
    • http://arslanemlak.come/file/63992402755.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/a449ac2a7c8f6276edce5a38d2bb53a4/sevofet.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/bss6f08r9gnbhe80s2fil49ok5/malig.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a34cfe146e5---39824341027.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/sapomokun.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50C 19008 bytes
SHA-256: d6a81ea6ebd77c22f65e1a94d0679d5ab5e806678368d9e25ac4b95c588585fd
font_01_sfnt_off00012672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12672 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E89 11236 bytes
SHA-256: 1179fdc825c0479dcb01c7a5b9eaaeb5a08bee8163116f527cb0f8907e2de204

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