Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1886f80ce2a7375…

MALICIOUS

PDF

84.5 KB Created: 2021-09-04 23:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6c6f9f10ec2f154e64dbc305cc0f0161 SHA-1: 445429bb8091714895f8595f1f3b9d4b3597e060 SHA-256: e1886f80ce2a73751eaff4edda4f4a9a09dbc1ab60ec6240201906e0178c4a74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://coretry.ru/uplcv?utm_term=compiler+design+pdf+tutorials+point PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091376b63b81---39878031180.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/68832520776.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/biravizexowipugawoporid.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/39265448038.pdfIn PDF document text
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/99528661756.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079dfc01c574---84349522170.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/senaxe.pdfIn PDF document text
    • http://cuatudongsaigon.net/uploads/files/37907125604.pdfIn PDF document text
    • https://digireg.cn/upload/39192579859.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/37316168329.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/14652190760f7d3c982b2d.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/73714833375.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/dec277fe7331904711797e8ad5819a90/8571718271.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/19738648857.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/jujupasijelulo.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/nomazaxefuwesefi.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/34606389244.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/teloromuvejunavipifoz.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/6a2d867244677924228c2745ffce35c5/40953031685.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/jowow.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecf5fd4339---12514649325.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/24775347137.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/62660562274.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/lunob.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/mezefarip.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/8515888638.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ea4ba478e---55613674867.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/snrh2jod8jjenugmj82srthmdn/34239388167.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_off0000e1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A3 10972 bytes
SHA-256: 9148603c38f30eee36bad81a6b627bbdba9382dac2e0904e867ab813131e05d0
font_01_sfnt_off0000fadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADB 18548 bytes
SHA-256: 46e66ef05bc720a1679e6925d68cc3356e1062332cf016ce8485ebf34ad149b3
font_02_sfnt_off00012bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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