Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4cbea5096fc2bdf…

MALICIOUS

PDF

95.2 KB Created: 2021-07-29 21:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b49b5f43761ba3a2546c4fcff3ac71d1 SHA-1: aa4f27a29432c5ab0cdbee2163482a6d22eb9f9b SHA-256: d4cbea5096fc2bdfafe478bf6808076100d221a87d9865352433a1e500b7a9cc
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The file contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics indicates a strong intent to distribute or phish. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://timandlor.com/userfiles/file/28842364658.pdf In PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/06f88d341542fd824b29acada9d179b6/34919883154.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/7fv9ctue2e66t42mn1m29uai60/milot.pdfIn PDF document text
    • http://prograsifkalip.com/files/78589769931.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/33326460837.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/3435d58bfb8427ed8eea243d91224655/zuvosegosusesokitof.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/0d5e6aa87b227b63d9c504a0f4dd0284/sukuwog.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/tuvewarebizetawab.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/wekasan.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/27695775965.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/492ed71c28f953264dba66b285699292/kavisesejusubasireneke.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da89f001bf---nokuwitoxobise.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/p602etc8eu0tjr9u7pe4hivq47/rexixinukaturatigep.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/p1983soj87smi84158tsfr7dd7/10546058713.pdfIn PDF document text
    • http://limitlessillusion.com/wp-content/plugins/super-forms/uploads/php/files/5641ec0eff865371a30c4f8283f8a3c7/96404112713.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/piwafonejajeriselik.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/zalapineleje.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/64673534707.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/75268689335.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/tiweviw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=bach+fugue+violin+sonata+2+sheet+musicPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11198 19692 bytes
SHA-256: 8169710b1c7760fbefdcc377db7fd15d178c01c2a24082b2f93c4c9404737b53
font_02_sfnt_off000143ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143EE 4104 bytes
SHA-256: b46c9e5dc58ced776850836b89de04629d7f936e3c41062e497b3083882d9d79
font_03_sfnt_off00015397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15397 11020 bytes
SHA-256: da965e9f1064c8dd9869e2c6509ff292c601a8f6d8a4486cd4244ec6d5c3a158

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